Rubinius supports 1.8 and 2.1 language modes.
A giant axe takes a swipe through the thicket of code...
Removed building nonexistent C-exts.
Migrate kernel to 2.1.
Moved C-API headers to 2.1 directories.
Use Bundler to install development dependency gems.
Only generate C-API header files for current language mode.
Some tweaks to start building the VM.
Include ruby.h instead of ruby/ruby.h for mode independence.
Use correct C-API header to build oniguruma and transcoders.
Handle C-API language-mode headers/files better.
Use absolute include paths building VM.
Ignore more generated C-API headers.
Ignore Gemfile.lock.
Update use of Rubinius.rubyXY? predicates.
Begin migrating to language mode static library.
Put transcoders in lib dir.
Set up development toolchain.
Optionalize running bundle install from configure.
Propagate language mode to env for bundler.