[BUG] [MINOR] Use buffer for specific py versions

Fixed MS static analysis warnings

Fixed warning building in VS2012

Fix build for platforms not supporting realpath

src\reflection.cpp(297): warning C4267: 'argument' : conversion from 'size_t' to 'flatbuffers::uoffset_t', possible loss of data

sizeof() was promoting the type from uoffset_t to size_t.

Fix vs2012 warnings

Cleaned up a few warnings to allow VS2012 to compile idl_parser and idl_gen_text (for exporting binary protobuf blobs as JSON) cleanly under static analysis.

Added a check for a preprocessor definition that can be set if the platform you're building for doesn't support any notion of absolute path resolution/realpath()/etc.

flatbuffers\src\idl_parser.cpp(1516): warning C4244: 'argument' : conversion from 'int' to 'char', possible loss of data

flatbuffers\src\idl_parser.cpp(1525): warning C4127: conditional expression is constant
flatbuffers\src\idl_parser.cpp(1546): warning C4127: conditional expression is constant

Fixed conflicts and added missing generated files.

Change-Id: I4321c798543292d814c2c9e8b238c203b7526c7b

Change-Id: I60c900a2f7cbd88fe264f7b0dc78ef86b1580655
Tested: in Chrome.

Change-Id: Ieb252ce01446551699d935507bc95ee286fe1ddd
Tested: on Linux.

Fix #2775: Add parser option to skip unknown JSON fields

(PHP) fixes getting indirect table, also fixes getInt method on 32bit machine

Catchup

Change-Id: I3c3e88a79667d1733b6c47e43b55d8b2604ca8e2
Tested: on Linux.

This is implemented as a template function, since Table::CheckField
is not reachable by subclasses of Table (private base class).

Change-Id: I1ed4d47ce7cb672460ccab61cf7442eb9136b0f1
Tested: on Linux.
Bug: 26273432

This to allow the code to run on a greater range of build
configurations (that don't allow exceptions/RTTI).

If anyone ever doubts the usefulness of exception handling,
please show them this commit.

Change-Id: If7190babdde93c3f9cd97b8e1ab447bf0c81696d
Tested: on Linux.

Improving the README by linking to the SO tag, and changing SO wording.

Also included them in the C++ test.

Change-Id: Ib0c8470f0aacdf16616c27494abdda57a010195d
Tested: on Linux.

C# - Performance optimizations

Fix for Issue 1741
Minor bug where python versions 2.7.x where x < 5 do not support
unpacking from memoryview objects. Versions 2.7.5 and above will
use memoryview while 2.7 versions below 2.7.5  will use buffer
objects.

Manual testing was performed on versions 2.7.5 and 2.7.2 to
confirm both worked correctly.

Performance tweak to FlatBufferBuilder.CreateString method to remove the unnecessary byte buffer allocation

(See https://github.com/google/flatbuffers/issues/55#issuecomment-164031718 for stats)

Change-Id: I272f377742cc0a2c1bfccaa641b54eb9a8c762b6
Tested: on Linux.

Change-Id: I7727aeb478feb23d8ef66fd1ba9499b142b3ea7d
Tested: on Linux.

Add Get Bytes Method Generator for C#