Added .proto parsing and convertion to .fbs.

Bug: 15777858
Change-Id: Iabef9b8c8044e593bb89510feebdee00d2f1840b
Tested: on Linux and Windows.
Added fenced code blocks to the C++/Java/Go docs for syntax highlighting.

Change-Id: I504915c6b5367e8c05dc056463158b8420ad8c5e
Tested: on Linux.
Fixed missing files in Xcode project.

Change-Id: I3480de9157fd6d0eeb123e77e448bd57c75c74ad
Tested: on OS X
Fixed big-endian issue.

Noticed a memory read that isn't big-endian safe. Was somewhat
benign in that it would have simply caused vtable duplication
when constructing a FlatBuffer on a big-endian machine.

Change-Id: I5de3a2bb3ce6912fdd845ed40668719794920cac
Various documentation improvements.

Change-Id: Iacea45ae0f602f49e46de472286a7a77ee20c301
Made CMakeLists.txt compatible with older versions of CMake.

By replacing DIRECTORY by PATH:
http://www.cmake.org/cmake/help/v3.0/command/get_filename_component.html

Change-Id: I6f5802deeda53dea443b255294235e43e7bb5389
Tested: on Linux.
Added support for custom allocators and uninitialized vectors.

This is helpful working with zero-copy use cases.

Bug: 15779698
Change-Id: I7097651ca9a432b5021b4e024da86398d1413ec7
Tested: on Linux and Windows.