Major code review, cleaning the code and adding a lot of comments. Also
implements a separate store to keep entities with a reference count and
garbage collection. This closes#15.
Known issues at the moment are:
* Webplayer is no longer working, it has to be refactored.
* AlbumPage is to be implemented.
Also includes misc fixes
* Use CSS modules for all the CSS.
* Fix a bug in the filterbar which was not filtering anything.
* Fix a l10n issue in songs view.
* Update hook to clean build repo before running, preventing to push
dev built code.
* Update webpack build code.
