Update to Ruby 2.0 encoding db
Update to latest Ruby 2.0.0 files
Update transcoding databases
Remove global data structure sharing
Remove ruby.h dependency
Fix transcoders for Rubinius
Add ENC_DEFINE for supported encodings
Add Ruby headers for extensions
Use return value instead of raising Ruby exception
Remove encdb files since we don't use them
Add Rubinius transcoder
Setup gitignore file
Remove unused C file for replicating GC2312 encoding
Add Rubinius optimization to allow regions on stack
Fix headers for building with Rubinius