Hash#element reference call eql? on objects in right order
fix some rubyspec master tags
Merge pull request #625 from kostya/fix_tags

fix rubyspec master tags
Merge pull request #624 from kostya/eql_in_hash

Hash#element reference call eql? on objects in right order
Expose ivars and cvars on classes.
these pass
remove a duplicated line
Implement Numeric#abs2

`self ** 2` is failed on RubySpec.
Because calling Numeric#* is a spec.
Merge pull request #629 from kachick/implement-numeric-abs2

Implement Numeric#abs2