revert #1974; ref #1979
Merge branch 'master' of github.com:mruby/mruby
Add -C (--directory) option to minirake.
Merge pull request #1980 from take-cheeze/minirake_directory

Add -C (--directory) option to minirake.
Fix method name
Merge pull request #1981 from k-tsj/fix-method-name

Fix method name in Array#reverse_each
according to JIS/ISO, Array is not Comparable