add general transformation utility for n-ary operators
[refactor] rewrite unary expression transformation with _transformOp method
[refactor] rewrite binary expression transformation as well
[refactor] rewrite assignment expression transformation as well
cosmetic fix
fix a bug in property assignment
add a tranformation function for assignments against array expression
remove dead code
fix a bug; transformation done doubly in vain
remove unused functions
add emitter for return statements
bugfix for prev commit
translate gotos into combinations with a function call and a return
[experimental] apply cps conversion to all methods
do not transform methods with for-in statements
add support for return statements in a void function