(Re)Added 'wps' proxy in Grunt setup (got overwritten by the last fha-next merge)
Fixes #13
WIP
Changed main layout to absolute positioning. For our purposes an absolute layout is working well and it circumvents some issues with wrongly positioned elements at certain screen sizes.

Fixes #7
Fix for BaseView to correctly handle the 'viewer' lifecycle. Also updated in-code documentation and changed dependent views accordingly.
SliceView: Adjusted default background color
minor: empty-view style adjustment
Merge branch 'fha-next' of https://github.com/v-manip/WebClient-Framework into fha-next