1) Added <builtinFunction> in createFunObj.
2) Updated handling of arguments object.
1) Added the completion type and the <completion> cell.
2) Added some statement semantics.
- Block, Empty, Expression, The return
Merge pull request #6 from jray319/master

Removed ambiguity and some fix.
Merge pull request #7 from tshull226/master

this binding for function calls
Merge branch 'master' of https://github.com/daejunpark/javascript-semantics