Split into Broccolifile and Stirfryfile; improve API, error handling
Show stack trace on error page
Add caching for ES6ConcatenatorCompiler
Only emit absolute module names
Tie down es6-module-transpiler version as it changes a lot and is pre-semver
JSHint you break my heart sometimes
Extract sample code into broccoli-sample-app; add interface for broccoli-cli
Fix links and remove note about Ember being hard-coded
Implement our own less error-prone watching; remove debounce logic
Fix jshint invocation

This did not trigger a failed build because JSHint still exits with zero
status when a file is not found.
https://github.com/jshint/jshint/issues/1405
Use faster built-in crypto library
Detect changes by stats hash, not just by max mtime