Bump chokidar to ^0.10.2
Clarify that this incrementally rebuilds

I was unaware that this module did incremental builds until Max mentioned it on twitter: https://twitter.com/maxogden/status/451609829648244736 This should be more prominent in the README
set max listeners on event emitter instances. Fixes maxListeners
warnings when watching multiple bundles.
2.1.1
Abstract watcher
Force realpath for all files