Implement Kernel#__callee__
Implement Integer#pred
Implement Integer#ord
Implement Integer#to_int
Squash returning self methods in Integer
Port to .py for some Integer methods
Merge pull request #633 from kachick/implement-kernel-__callee__

Implement Kernel#__callee__
Merge pull request #634 from kachick/some-integer-methods

Implement some Integer methods, and port to .py
module_eval uses lexical scope of its block
Merge pull request #632 from garybernhardt/master

module_eval uses lexical scope of its block (fixes #631)