Add fontello icons.

Remove this when we have octicons for audio and video

src/packages/collaboration/stylesheets/collaboration.less

@@ -1,5 +1,6 @@
 @import "bootstrap/less/variables.less";
 @import "octicon-mixins.less";
+@import "fontello-mixins.less";
 
 @video-padding: 5px;
 @large-width: 160px;
@@ -141,11 +142,11 @@
 
       .toggle-video{
         margin-left: 5px;
-        .mini-icon(arr-right);
+        .fontello-icon(fontello-video);
       }
       .toggle-audio{
         margin-left: 5px;
-        .mini-icon(arr-up);
+        .fontello-icon(fontello-audio);
       }
     }
 

static/fontello-mixins.less

@@ -0,0 +1,20 @@
+@fontello-video: "\e800";
+@fontello-audio: "\e801";
+
+.fontello-icon(@name, @size: 16px) {
+  &:before {
+    font-family: 'fontello';
+    font-weight: normal;
+    font-style: normal;
+    display: inline-block;
+    line-height: 1;
+    -webkit-font-smoothing: antialiased;
+    text-decoration: none;
+
+    font-size: @size;
+    width: @size;
+    height: @size;
+
+    content: @@name
+  }
+}

static/root-view.less

@@ -72,3 +72,10 @@ html, body {
   font-weight: normal;
   font-style: normal;
 }
+
+@font-face {
+  font-family: 'fontello';
+  src: url("fontello.woff") format("woff");
+  font-weight: normal;
+  font-style: normal;
+}