add String#scan
fix translation
Hash compares
Merge pull request #708 from kostya/hash_cmp

Hash compares
fix Hash#replace
Merge pull request #709 from kostya/hash_replace

fix Hash#replace
Proc#arity
Merge pull request #711 from kostya/proc_arity

Proc#arity
Merge pull request #655 from topazproject/tim/String#scan

Missing String#scan
untag some specs
Merge pull request #712 from kostya/untag

untag some specs