added String#b method
[Truffle] Alias Hash#has_key? to Hash#key?.
remove those "bundle" is not a known protocol error
[Truffle] Use @CreateCast and BooleanCastNode to avoid duplication.
Merge pull request #2327 from jkutner/jruby-1_7-missing-methods

added String#b method
Merge remote-tracking branch 'origin/jruby-1_7'
[build] omit the Properties Maven Plugin if there is no build.properties [skip ci]
[Truffle] Make it clear what in our Ruby code is just there as a shim.
Revert until I figure this regression out
[Truffle] Work on Struct.