adding test code for Token
adding CommentToken
trying to fix bugs at parser
bugs fixed at tokenizer
fix OperatorToken
bugs fixed at Vacume
Merge pull request #4 from imasahiro/FixOperatorToken

fix Tokenize OperatorToken
optional for $Block$ in FuncDecl
t pushMerge branch 'master' of github.com:GreenTeaScript/GreenTeaScript
fix SourceGenerator
fixed method call and variable typing
changed the attribute of SyntaxTree.toString