add `--cache` option to `6to5-node`
add support for exportdeclarations to constants
add in todo for a better t.isReferenced
make first node in a class body inherit class comments
add roadrunner dependency
change generators/async functions to reference regenerator runtime rather than the polyfill
add if statement to class super constructor call
remove custom regenerator runtime from dist
add note about sourcemaps and 6to5/register
clarify es5 and add getters/setters in IE 8<= to caveats fixes #314