Init commit for spotify app.

Added boilerplate app with 3 tabs.
Added gruntfile with jshint for now.
gitignore update
app added as nonsubmodule
app: banner added.

now playing js file added.
toplist tab js added
search.js added.

banner updated: link now has black bg
Merge branch 'spotify-app-init' into spotify-app
search.js now fixed.

call to module in main.js was missing.
now.js: curArtistURI
jquery added.
related artists showcase.

shows list of related artists of current playing
artists.
styled grid
graph drawing with depth = 1. using visjs
Merge branch 'feature-nowplaying' into spotify-app
updated tabs view

manifest tabs replaced for the UI module.
grid layout removed.
Merge branch 'spotify-app'

First version of RAMA Spotify App