Simplifying code to pave the way for ES6 harmony generator support.

* Removed deprecated features (flow.func, asyncblock.wrap)
* Removed flow.future and async().future() transform
* Removed enumerator support
Updating benchmark script
Progress on harmony generator support
A little cleanup
More progress on generator support
Finished up error tests for generator support
Adding "waitless" yield syntax for generators
Progress towards replacing parser with Esprima (to support ES6 generator syntax)
More progress on replacing parser with Esprima
All tests passing with Esprima parser
Small optimization in source transformer
A couple optimizations / fixes
defer bugfix
Fix an issue with transform where the first require isn't the asyncblock one
Switching fibers reference version
Bugfix
Fix a bug with defer variable replacement
Adjusting fiber version again to see if it helps w/ segfault
Fix an issue with accessing properties on defer variables
Remove console.log