Adding controls to web interface

Giving users control of music through a web interface

- Play/Pause
- Progress bar
- Back/Next
- Volume control
- Querying
- Play a query result
- Link to download the audio stream

![screen shot 2014-01-19 at 5 56 41 pm](https://f.cloud.github.com/assets/1403880/1951275/36af68de-8176-11e3-9e3d-32d29879c1a7.png)

![screen shot 2014-01-19 at 5 59 21 pm](https://f.cloud.github.com/assets/1403880/1951286/84821bf6-8176-11e3-809a-2ac733e82c9c.png)


I included commits from the [1stdibs fork](https://github.com/1stdibs/Spot/) in order to query results and receive how many seconds are left in the song.