Switch collapse order in navbar

Order is now logo, buttons - and messages last, because they should be
visible pretty much at all times.

Should probably switch to a toast layout for messages soon.
Include ngAnimate - fix related navbar bug
Add fade and fade-in ngAnimate css classes
Make use of new ngAnimate fade-in
Merge pull request #306 from latin-language-toolkit/ng_animat

Start to use ngAnimate
Use search as input type for search forms
Make active plugin public
Update sidepanel directive with plugins service
Reactivate repeaters for next/prevTab key bindings
Add skeleton for arethusa.comments
Move arethusaLoaded var to state
Add comments to sg conf
Start to do the CommentsRetriever
First steps in comments service
Read in real chunk identifier in comments
Show that it works in comments template
Pass the correct comment obj in CommentsRetriever
Minor refactor in navigator

In navigator.updateState we need to update the navigators id before
we replace the state, as is this triggers an event - listeners might
already want to see an updated state.
Start to use real data in CommentsRetriever
Comments need to be in an array

There could be several comments to a single token.