Add documentation, `allowBlank` flag, tests
Try out travis-ci
add willDestroyElement handler for teardown
Add more tests, remove PhantomJS failing test
Add documentation to allowBlank option
Push version number for allowBlank & tests
updates for ember-cli 0.0.44
Various changes by iStefo

* changed build status indicator in README
* ensured merge works for ember-cli 0.0.44