add mrb_mod_remove_method/remove_method
add test for Module#remove_method
Merge pull request #677 from skandhas/pr-add-Module-remove_method

Add Module#remove_method for mruby
Fix a wrong comment
Merge pull request #678 from authorNari/patch-1

Fix a wrong comment
Merge branch 'master' into cruby_building_script
Removed CMakefiles