kikito/middleclass — pull request #18 by kenshinx (2013-12-02 03:54:13+00:00)
Title: new metamethod __len,__pairs,__ipairs in lua 5.2

`__len`,`__pairs`,`__ipairs` has been released in lua 5.2.
I have test these three metamethod in middleclass, it can work correctly.
Please consider merge this branch into master . Thanks