Fix tests.

Fix incorrect jQuery path and sanitize input to avoid https://docs.angularjs.org/error/$sce/unsafe
Failing test for scoped messages
Scoped flash messages
Cleanup initial implementation and add more tests
Add firefox-launcher to package.json for travis
Bump version and update README
messages -> _messages() and make the scope key configurable.
Fix bug where adding a duplicate scoped message resets the scope prematurely
Merge branch 'scoped_messages'
Update dist