Add environment variables
Set up Travis encryption
Add unit tests for user related methods
Update encrypted file
Add missing limit to testGetMySavedTracksLimit()
Set correct return type
Try out coveralls
Add Coveralls badge [skip ci]
Make tests more stable
Improve tests some more
Add market option to SpotifyWebAPI::getArtistAlbums()
Speed up Travis a bit [skip ci]
Support limit and offset on getUserPlaylistTracks