Fixed issue with channel name in url and added loading icon to replace 'Join' button for slow connections

web/sass-files/sass/partials/_sidebar--left.scss

@@ -124,7 +124,15 @@
 }
 
 .channel-loading-gif {
-    height:15px;
-    width:15px;
-    margin-top:2px;
+    height: 15px;
+    width: 15px;
+    margin-top: 2px;
+}
+
+.join-channel-loading-gif {
+    margin-top: 5px;
+    margin-left: 10px;
+    height: 25px;
+    width: 25px;
+
 }