Work on new box overlay

- Redo the whole html
- Missing mouse-over overlay
Integrate select2 plugin.
Improve Dashboard filter.
Get rid of un used plus style and add new css for Dashboard filter.
Remove old left menu nav, and remove from the css the padding that was pushing the content to the left.
Mouseover overlay for the boxes
Merge branch 'development' of github.com:joanrm20/maua

Conflicts:
	src/app/components/dashboard/templates/track-list.tpl.html