Implement __vector_as_bytes and methods to get [ubyte] efficiently

Added --gen-name-strings command line option.

To support the use case described in issue google/flatbuffers#3826, a new command line option --gen-name-strings
has been added, which will cause a static GetFullyQualifiedName function to be added
to the C++ output for tables/structs.

Currently in order to get a value type of [ubyte] in PHP, iteration is
necessary which is not efficient. Helper __vector_as_bytes has been
implemented in order to return the byte arrays in PHP efficiently.

Appropriate methods also been added to use aforementioned method to return
the byte array. (e.g. get*Bytes()).

The reason the methods are named get*Bytes() and not for instance
get*ByteArray() is the fact that PHP doesn't support byte arrays and the
binary safe string implementation in PHP is used to simulate byte arrays
and since there is chance for PHP users to confuse this with PHP arrays
the name get*Bytes() has been chosen.

In the future __vector_as_bytebuffer() method can also be implemented to
return PHP implementation of ByteBuffer.

Tutorial's Java example uses incorrect types

`FlatBufferBuilder.createString` returns an int offset, not a string

Update google user group link

Original link returns 404.

Change-Id: I95bc50ecd3b49d91fb81477a8818e3c1f253ff77

Change-Id: I9576e130142acc697fadbfb6aacfd5969f25866a
Tested: on Windows.
Bug: 27426239

Change-Id: I790cf681c1bffff800d77afb0e2f908d1c827679
Tested: on Linux.
Bug: 26186542

This is FAQ on the issue tracker.

Bug: 26863353
Change-Id: I227e10a5c0134dbe7fd7f59e64cd57a0752c568e

Fixed missing -lc++abi on FreeBSD.

Fix small typo in documentation navigation

Javascript helper to get typed array views

Fix #3773: Generated JS now avoids the flatbuffers object

Fix bug skipping unknown fields

Catchup

Change-Id: I834e6da091ea704a3fe599a5b99f338d29cd3bf1

The code generator was assuming all declarations for the current
file sit in the same namepace. Now uses the "on demand" namespace
switching we had for the forward declarations.

Also fixed a bug related to namespace lookup.

Change-Id: Ib54a3efbc752cbb9590302fa0707c0c73448db3d
Tested: on Linux.

For scalar vector fields, emit an Array helper that
returns a typed array view of the underlying bytes buffer.

The generated buffer should be tested for semantic equivalence
to the correct buffer, instead of being tested for bytewise
equality.

fix gcc-4.4 build: -Werror=unused-result is not supported

This caused values in the uint range to be made negative values.

Change-Id: Ia4284747f48508b589c034ff3aae0d141e96eb3c
Tested: on Linux.

Python: remove ctypes dependency in runtime library.

Change-Id: I080041e533153b2bb2db53f030761852e95c88fa

Add -v --version arg support to the flatc command.

Update readme.md for github