Fixes #128
Some fixes with running coverage with the new version of karma-coverage.
Add feature for #77, event `ta-drop-event` is fired, default function handles images being dropped only, allows optional overriding of the default function and it's use as a fallback.
Merge branch 'master' of https://github.com/fraywing/textAngular

* 'master' of https://github.com/fraywing/textAngular:
  Some fixes with running coverage with the new version of karma-coverage. Add feature for #77, event `ta-drop-event` is fired, default function handles images being dropped only, allows optional overriding of the default function and it's use as a fallback.
  Fixes #128