[refactor] use while statement insted of Iterator
[refactor] remove LocalVars field from ControlflowGraph
remove Iterator of HashSet
bugs fixing at ZNameNode..
fixed at confict of ssa
necessary files in ext
rename ssa transformer
fixed array boundary check @ ZArray.SetIndex, ZArray.GetIndex
added ZArray.Reserve(int)
rename ssa transformer
reimplement SSAConverter.
added SSAed CGenerator
Bug fixed at ZListNode.InsertListAt(int Index, ZNode Node)
modified to add item to the new list
fix infinite loop in ZASTTransformer
rename package name libbun.parser.ssa2 => libbun.parser.ssa
refactor SSACGenerator
added GetCurrentVariablesBefore(), GetCurrentVariablesAfter()
added _IsDigitOrLetter
Merge pull request #2 from imasahiro/UpdateSSA

Refactor ssa transformer (Part2)
added RegExp literal