Fix the calc_crc_16_ccitt signature to match the source file
Merge pull request #1118 from nemerle/fix_crc_signature

Fix the calc_crc_16_ccitt signature to match the source file
Move Integer.{floor,ceil,round,truncate} to mrblib/. For maintainability.
Remove unused functions.
Integer.round have no arg.
Merge branch 'master' of github.com:mruby/mruby