Add support for deleting a conversation

Note that the conversation record is not actually destroyed,
merely marked inactive, preserving the contact name, photo,
etc...

js/views/conversation_view.js

@@ -14,7 +14,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 (function () {
-  'use strict';
+    'use strict';
     window.Whisper = window.Whisper || {};
 
     Whisper.ConversationView = Backbone.View.extend({
@@ -39,7 +39,17 @@
 
         events: {
             'submit .send': 'sendMessage',
-            'close': 'remove'
+            'close': 'remove',
+            'click .destroy': 'destroyMessages'
+        },
+
+        destroyMessages: function(e) {
+            if (confirm("Permanently delete this conversation?")) {
+                this.model.destroyMessages();
+                this.model.collection.remove(this.model);
+                this.remove();
+                this.model.trigger('destroy');
+            }
         },
 
         sendMessage: function(e) {

js/views/inbox_view.js

@@ -32,7 +32,11 @@
                 collection : this.conversations
             });
 
-            this.conversations.fetch({reset: true}).then(function() {
+            this.conversations.fetch({ reset: true }).then(function() {
+                this.conversations.reset(
+                    //TODO: Add an index to support this operation at the db level
+                    this.conversations.filter(function(c) { return c.get('active'); })
+                );
                 if (this.conversations.length) {
                     this.conversations.at(0).trigger('render');
                 }