Feature/mg/library artist extention

- list all artists
- click on tile to search for the name of the artist
- for library and event song suggestions/votings
- responsible layout

![2014-12-28 16_39_05-songster - you make the party](https://cloud.githubusercontent.com/assets/1218033/5564223/88a09882-8eb0-11e4-93f1-b83f476f032d.png)
![2014-12-28 16_39_13-songster - you make the party](https://cloud.githubusercontent.com/assets/1218033/5564224/8aa956a0-8eb0-11e4-898d-fcab512f798f.png)
![2014-12-28 16_38_43-songster - you make the party](https://cloud.githubusercontent.com/assets/1218033/5564225/8cb457b0-8eb0-11e4-84ae-0ab962155e24.png)