Improve search view

This branch aims to improve the search result view by:
- Showing results for artists, albums and tracks in jQuery Mobile widgets to allow for progressive enhancement.
- Limiting the amount of artists and albums that are shown by default.
- TODO: Displaying artist and album art as thumbnails.

This is how it currently looks:
![search-results-view](https://f.cloud.github.com/assets/114321/1123610/3b6f5a7c-1af2-11e3-9d35-afff78b3b6a3.png)

When the context menu button is clicked:
![search-results-view](https://f.cloud.github.com/assets/114321/1123606/10936d7a-1af2-11e3-9f73-d67c332f21ca.png)

Please let me know if there is anything you don't like that I can adjust so that you are happy, because I would prefer not to maintain my own fork.