Fix build for platforms not supporting realpath

Fix vs2012 warnings

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

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#

Extend C# ByteBuffer Put method fix to unsafe methods

Update C# FlatBufferBuilder to reuse vtable array

Fixes issue #243.  Extends the initial C# ByteBuffer fix
(e4c3bf3d) to Put methods
used when UNSAFE_BYTEBUFFER is defined.

This commit updates the FlatBufferBuilder class to reuse the vtable
array instead of creating a new array with every StartObject() call.

Fix to #360 - Fully qualified names outside of current NS

Correct the max/min signed/unsigned 32-bit int

Change-Id: I36c1f05efa836b32635e3274ac0ba976a8961bdd
Tested: on Linux.

It's slightly faster to convert the value to signed value in PHP as
opposed to use pack and unpack.

For 1M get operation the difference is:

    getShort in 3.3272678852081 seconds
    getInt in 3.8338589668274 seconds
    getLong in 5.6381590366364 seconds
    getLong (neg) in 5.6149101257324 seconds

vs

    getShort in 2.7564418315887 seconds
    getInt in 3.1612701416016 seconds
    getLong in 3.1369340419769 seconds
    getLong (neg) in 3.1478710174561 seconds

And since pack("P") and unpack("q") has been removed now ByteBuffer
works for PHP >= 5.4