Download and build with a known grpc version

With the old-style code, the test fails with a borrow-checker error:

```
  #[inline]
  pub fn name(&'a self) -> &'a str {
    self._tab.get::<flatbuffers::ForwardsUOffset<&str>>(Monster::VT_NAME, None).unwrap()
  }
```

```
error[E0597]: `e` does not live long enough
   --> tests/integration_test.rs:273:57
    |
273 |         let enemy_of_my_enemy = monster.enemy().map(|e| e.name());
    |                                                         ^      - `e` dropped here while still borrowed
    |                                                         |
    |                                                         borrowed value does not live long enough
274 |         assert_eq!(enemy_of_my_enemy, Some("Fred"));
275 |     }
    |     - borrowed value needs to live until here
```

* Add more apis to query vector types from a reference

https://github.com/google/flatbuffers/issues/4818

* changing order of apis

* another reordering

* removed vector element type api as not needed as for now

* Fixed MakeCamelCase behavior when supplied Upper_Camel_Case,
snake_case and UPPERCASE strings.
* Modified the rust integration test to reflect changes.

* Add FlatBufferBuilder move semantics tests to main

Do not eagerly delete/reset allocators in release and release_raw functions
Update android, vs2010 build files
New tests for various types of FlatBufferBuilders and move semantics

* Improve test failure output with function names

* Add operator== for c++ genated code

New "--gen-compare" option for flatc to generate compare operators. The operators are defined based on object based api types.

Inspired by issue #263.

* Improve compare operator for c++.
Thanks for the code review.

- Improve robustness against future schema extensions
- Code style
- Fix --rust generation in generate_code.sh

Change-Id: I9b0664a3bde44a4ee44ef0fd117d0e4bedc132d9

Different implementations of std::hash kept littering commits with
namespace changes.

Change-Id: Ic2d4fdcd76f8fef9802bc1572eb74ae7427085e3

Change-Id: Ic97f5b50fa191f967672c404f737d302462fc6ac

* C# support for directly reading and writting to memory other than byte[].  For example, ByteBuffer can be initialized with a custom allocator which uses shared memory / memory mapped files.

Public access to the backing buffer uses Span<T> instead of ArraySegment<T>.

Writing to the buffer now supports Span<T> in addition to T[].

To maintain backwards compatibility ENABLE_SPAN_T must be defined.

* Remove usage of expression bodied method so that ByteBuffer can be compiled with older version of C#.

This adds the ability to dispose unused buffers or to return them to an object pool

Manual vector creation begins with start_vector, not create_vector.

Imports the Rust FlatBuffers runtime crate even when not using a namespace in a schema.

This is a port of FlatBuffers to Rust. It provides code generation and a
runtime library derived from the C++ implementation. It utilizes the
Rust type system to provide safe and fast traversal of FlatBuffers data.

There are 188 tests, including many fuzz tests of roundtrips for various
serialization scenarios. Initial benchmarks indicate that the canonical
example payload can be written in ~700ns, and traversed in ~100ns.

Rustaceans may be interested in the Follow, Push, and SafeSliceAccess
traits. These traits lift traversals, reads, writes, and slice accesses
into the type system, providing abstraction with no runtime penalty.

Add move semantics to MessageBuilder, FlatBufferBuilder, SliceAllocator, and vector_downward (#4893)

Unit tests
Update flatbuffers + gRPC build instructions
Update CMakeLists.txt with cmake variables for grpc and protobuf install paths
Update tests for travis build

* Simple ReleaseRaw implemented

* [doc]

* clear_buffer and clear_allocator introduced

* auto

* typos

* rename because of -Werror=shadow

C# support for directly reading and writting to memory other than byte[].  For example, ByteBuffer can be initialized with a custom allocator which uses shared memory / memory mapped files. (#4886)

Public access to the backing buffer uses Span<T> instead of ArraySegment<T>.

Writing to the buffer now supports Span<T> in addition to T[].

To maintain backwards compatibility ENABLE_SPAN_T must be defined.

* Added preprocessor define for C++ if Template Aliases are supported by the compiler

* Revert "Revert "Performance Increase of Vector of Structures using .NET BlockCopy (#4830)""

This reverts commit 1f5eae5d.

* Put<T> method was inside #if UNSAFE_BYTEBUFFER which caused compilation failure when building in unsafe mode

* Revert "Added preprocessor define for C++ if Template Aliases are supported by the compiler"

This reverts commit a75af7352127c261baf0b6cca5cb823e13e78f11.

This reverts commit 7b50004e.

Change-Id: I09d6869c16aa3c7fadc537fc9c76eaa3cf7ee7ea

Change-Id: I836091193485b890710f1df779d4d770f729a27a

* Added 'private' attribute, supported when generating C# and Java

* Added use of 'private' attribute in monster_test

* Build Conan package on Travis CI (#4590)

- Added multi package support on Linux, running on Travis CI
- Only upload when branch is a tag and named "vX.Y.Z"
- Replace Conan injection by Conan wrapper
- Removed os_build os_arch -- Conan 1.0.1 hotfix
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Build Conan package on OSX (#4590)

- Added jobs to build Flatbuffers on OSX running on Travis
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Build Conan package on Windows (#4590)

- Added support necessary to build Flatbuffers on Windows (conan)
- Added Appveyor jobs to build Conan package
- Only build Conan package when release (tag)
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Reduce Conan CI support to simple scripts (#4590)

- Removed msvc 10 x86_64 workaround
- Updated conan remote address
- Added Bincrafters' package tools
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Add fPIC option on Conan recipe (#4590)

- Add fPIC as optional. It works on Linux and OSX
- Update recipe metadata: author, homepage, license
- Checking for flatc and flathash on Conan package
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Build Conan package on CI (#4590)

- Add rule to run conan job only for tags
- Run Conan on Linux, OSX and Windows
- Update package tool to new interface
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Update Conan username (#4590)

- Use google as default username
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Update OSX version on CI (#4590)

- Use latest OSX 9.3 version to build Conan package
Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Proposing use of C++ header files and functions 

Proposing use of C++ header files and functions instead of C header file and functions. 
Here are few examples for comparison : 

C                            C++
<cstdio>                <iostream> & <fstream>
printf()                     cout 
fopen()                    ifstream
etc ...

Please let me know if there are any comments.

* Updated diff based on review comments