Seye Ojumu

that _does_ look pretty cool. @nickwph would you rather use that?

add to codecov, instead of coveralls

Made a couple changes based on information from [here](http://stackoverflow.com/questions/33621079/running-mocha-istanbul-babel/35976233#35976233). Something to be aware of -- the tests seem to take **_much_** longer to run now; especially on v0.12. Maybe we...