Use scut sass mixins

* vcenter spinner in read-view
* vcenter lightbox
Cleanup before refactor with ngAnimate

* Add ng-animate module in libs
* Move error dialog init to app.run
* Include error dialog template only once in index.html
* Fix race condition between ng-repeat, ng-class using ng-animate
[WO-333] Fix lightbox outer scrollbar

* Use ng-animate with display:none instead of visibility:hidden
* Fix min-height in lightbox
* Start refactoring lightbox opening code using scope.state.lightbox
Seperate ng-repeat and ng-class in writer address headers for ng-animate
Fix jumping send button in writer
Fix mail-list filtering and iScroll refresh together with ngAnimate
Global key shortcut to close lightbox
[WO-336] Fix floating fingerprint popup in contacts view