use font awesome icon for watching channel

app/assets/stylesheets/custom.css.erb

@@ -536,10 +536,6 @@ height:100%;
     padding-right:10px;
 }
 
-.watchButtonImage {
-float:left;background-position:left;background-image:url('eye.png');background-repeat:no-repeat;width:19px;height:16px;
-}
-
 .watchButtonPadding {
     padding-right : 5px;
 }

app/views/channels/_socialbuttons.html.erb

@@ -3,7 +3,7 @@
     <div class="buttonlets padded watchButtonPadding">
       <%= check_box_tag 'watch', 1, current_user.watchings.check(current_user.id, @channel.id) %>
       <label for="watch" class="watchButtonLabel" >
-        <div class="watchButtonImage"></div>
+        <i class="fa fa-eye pull-left"></i>
         <div id="watchText" class="watchButtonText">Watch</div>
       </label>
     </div>