Correct comment in exception test.

Support extension '.cc' in source code listing.

Implement Module#initialize (15.2.2.4.31)

Merge branch 'add-exception-test' of https://github.com/yui-knk/mruby into yui-knk-add-exception-test

Move `Kernel.local_variables` to core.

that not have methods each other

This fix use UINT16_MAX for NULL symbol tag, that means maximum symbol length
is not UINT16_MAX-1.

Add Range#size

Add test for remove_instance_variable

Add ISO index to `Kernel.local_variables`.

Add ISO index to `Kernel.eval` and `Kernel#eval`.

support class define in singleton class

Add a space aftre bracket.

Fix indent in mrb_hash_to_hash()

Use boolean macro in exc_equal.

Remove space.

instance method name use "#" instead of "." for assert