fFix module formatter parsing bug where literals were being converted to identifiers
add end/start user transformers
add declaration/reference support to scope
fix export and import specifier getIds and add support for computed properties to isReferenced
fix let variable declaration hoisting bug. All let variable declarators now have a default initializer of `undefined` unless they're the left of a `ForIn` or `ForOf`
fix a catch param property identifier incorrectly being replaced when exploding statements in generators - fixes #301
move jshint to normal dependencies