Added spotify-control.sh

spotify-control
===============

Bash script to control Spotify Linux via DBus

Usage
-----
./spotify-control <command>
  - play
  - next
  - prev
  - getTitle
  - getArtist
  - getAlbum
  - getStatus (Playing/Paused/etc)

References
----------
I have taken code / inspiration from the following:

[John Hamelink](https://github.com/johnhamelink/spotify-status)
[Mabishu](http://www.mabishu.com/blog/2010/11/15/playing-with-d-bus-interface-of-spotify-for-linux/)