Added Searching Features

* Added Thread Search Feature

* Added User Search Feature

* Re-organized searching, added @mention support to author search

app/views/forums/index.html.erb

@@ -1,5 +1,7 @@
 <% title "Forums" %>
 
+<%= link_to "All threads", forumthreads_path(params.except("controller", "action")), class: "btn blue right" %>
+
 <div id="forum_groups">
   <% @groups.each do |group| %>
     <div class="item-group" id="group-<%= group.id %>">
@@ -56,4 +58,4 @@
   <%= link_to "New group", new_forumgroup_path, class: "btn blue" %>
 <% elsif mod? %>
   <%= link_to "New group", "#", class: "btn blue", disabled: true %>
-<% end %>
+<% end %>