Add vector?
Add strip-syntactic-closures
Fix to 'identifier=?' compares between symbol and alias
Fix 'quote' syntax behaviour and add 'syntax-quote'
'identifier=?' compares between symbol name not bounded to env.
(==) for syntatic environment, syntatictic closure
Add 'macroexpand'
Fix bug that 'cond' does not work properly when using '=>' style. close #14
Import 'or', 'and', 'for-each' from chibi sheme
Import 'syntax-rules' from chibi scheme. close #11
Add unit tests for macro transformer
Modify macro transformer descriptions in README