Move `__method__` to mruby-kernel-ext since it's not ISO method.
pacify MSVC warnings for time.c
Refactoring test to use assert_nothing_raised.
Remove use of mruby-proc-ext method.
Add assert to Exception#inspect test.
Merge pull request #2218 from take-cheeze/move_method

Move `__method__` to mruby-kernel-ext since it's not ISO method.
Merge pull request #2220 from yui-knk/refactor-test

Refactoring test to use assert_nothing_raised.
Merge pull request #2219 from kyab/fix_msvc_warning_time.c

Pacify MSVC warnings for time.c
Merge pull request #2222 from take-cheeze/remove_proc_meth

Remove use of mruby-proc-ext method in core test.
Merge pull request #2221 from yui-knk/add-exception-test

Add exception test