Merge pull request #1 from guidokessels/master

Add Play Next Song and Play Previous Song functionality
Prepare 0.2.0 release
Change default previous/next track keyboard shortcut to not interfere with default text editor behavior.
Fixing Issue #2, Don't try to grab the current track unless Spotify is running.
Prepare 0.3.0 release
Update README to reflect new default keyboard shortcuts.
Prepare 0.3.1 release
add option for left/right placement, add "equalizer" ala atom-rdio
bump version number
Merge pull request #3 from chrisb/placement-options-and-equalizer

Add options for left/right placement, add CSS "equalizer" (ala atom-rdio)
Prepare 0.4.0 release
Add if track conditional back in. Closes #4.
Prepare 0.5.0 release
Settings changes are applied live
Fix sound bar anomation not being paused when player is
SoundBars start hidden and paused
Add play, pause, togglePlay keybindings
Merge pull request #7 from ArnaudRinquin/feature_live_settings_refresh

Feature live settings refresh and play/pause/toggle keybindings
Prepare 0.6.0 release
exposed togglePlay via the menu bar