General fixes to make things work

* Change albumArtCache.py to use proper python pep8 stylings
* Fix regression in AlbumArtCache to stop iterating non-stop
* Adapt classes to changes in albumArtCache.py
* Fix Minor styling issues
* Fix LoadMore Button behaviour
Fix pep8 issues
pep8: remove whitespace
Merge pull request #29 from gnome-prototypes-team/fixes1

General fixes to make things work