New Version

- Add option to buy songs instead downloading them (download option is
still available but the button is more hidden)
- Change name to "GoearPlayer"
- Bootstrap 3.1.1
- Disable Desktop version
- The played song is shown on the title of the webpage.
- A play icon is shown in the webpage titlte when a song is being
played.
- Webpage title does not include search term anymore.
- Change MP3 URL based on the URL used now by Goear.
- Change the way the song image is obtained: if the JSON does not
include a valid image, a new image is tried to be obtained based on last
changes on Goear.