Updated Italian translation
Updated Czech translation
add to playlist button should be insensitive when there is no selection.
Updated Brazilian Portuguese translation
Merge pull request #131 from sumansai14/master

add to playlist button should be insensitive when there is no selection.
Merged github changes

 * added css classes for cover and title in artistalbum widget in ui.
https://github.com/gnome-prototypes-team/gnome-music/issues/127

 * add to playlist button should be insensitive when there is no selection.
 https://github.com/gnome-prototypes-team/gnome-music/issues/131
Load default icon using Gtk.IconTheme

We are using an absolute path before, which doesn't take into account the
current theme and icon path.
albumArtCache: Move to new class the loading of album art from uri

Create a new class GetUriRequest which would download the image from the uri.
albumArtCache: Merge lookup and lookup_or_resolve

Merge lookup and lookup_or_resolve into lookup, then move their callbacks to a
new class.
Update callback calls for latest changes in album art loading