Add remove button for tracks in playlists.

Resolves #3

public/templates/directives/tracks-list.html

@@ -12,6 +12,9 @@
             <a pfm-eat-click class="icon-favourite" href="#" ng-click="toggleFavourite(track)" ng-if="::auth.isLogged">
                 <i class="icon-star-empty"></i>
             </a>
+            <a pfm-eat-click href="#" ng-click="removeFromPlaylist(track)" ng-if="::canModifyPlaylist()">
+                <i class="icon-trash"></i>
+            </a>
         </div>
         <a class="info" ng-href="{{::track.url}}">
             <span class="title">{{::track.title}}</span>

public/templates/playlists/show.html

@@ -57,7 +57,7 @@
             </div>
 
             <h2>Tracks</h2>
-            <pfm-tracks-list tracks="::playlist.tracks"></pfm-tracks-list>
+            <pfm-tracks-list tracks="::playlist.tracks" playlist="::playlist"></pfm-tracks-list>
 
             <pfm-comments type="playlist" resource="::playlist"></pfm-comments>
         </div>

resources/assets/scripts/app/directives/tracks-list.coffee

@@ -19,14 +19,23 @@ module.exports = angular.module('ponyfm').directive 'pfmTracksList', () ->
     templateUrl: '/templates/directives/tracks-list.html'
     replace: true
     scope:
-        tracks: '=tracks',
+        playlist: '='
+        tracks: '=tracks'
         class: '@class'
 
     controller: [
-        '$scope', 'favourites', 'player', 'auth'
-        ($scope, favourites, player, auth) ->
+        '$scope', 'favourites', 'player', 'playlists', 'auth'
+        ($scope, favourites, player, playlists, auth) ->
             $scope.auth = auth.data
 
+            $scope.canModifyPlaylist = ->
+                $scope.playlist and $scope.auth.isLogged and $scope.playlist.user.id == $scope.auth.user.id
+
+            $scope.removeFromPlaylist = (track) ->
+                playlists.removeTrackFromPlaylist $scope.playlist?.id, track.id
+                .done ->
+                    $scope.tracks = _.reject $scope.tracks, (t) -> t.id == track.id
+
             $scope.toggleFavourite = (track) ->
                 favourites.toggle('track', track.id).done (res) ->
                     track.user_data.is_favourited = res.is_favourited