Implement spinner service and directive
Spin when Resource makes requests
Use spinner in navbar
Collapse buttons a little sooner

Former calculations we're off a little bit and could lead to display
errors in gray areas.
Merge pull request #226 from latin-language-toolkit/spinner

Spinner service and directive
Get rid of previous and next buttons in morph3
Add checkbox to always expand the morph accordion
Add backwards rotation css class
Add settings panel to morph3
Extract settingsTrigger to own directive