big @mentions update

1. switched from autocomplete.js to jquery-textcomplete
2. style update
3. Allow mentioning by ign OR display name
4. display names can be two words and separated by a space
5. display names can be all characters, except a few special ones (punctuation etc)
6. Wildcard characters are escaped in SQL
7. Suggestions are html escaped
8. Suggestions have a timeout of 300ms, so the query is made after you stopped typing

app/assets/stylesheets/application.css

@@ -3,4 +3,5 @@
  *= require style.css
  *= require mobi.css
  *= require highlight/default.css
+ *= require jquery-textcomplete
  */

app/assets/stylesheets/style.css.scss

@@ -485,20 +485,24 @@ blockquote p {
       display: none;
       padding: 4em 1em 1em;
     }
+  }
+}
 
-    .suggestions {
-      background: #ddd;
-      padding: 0.5em;
+ul.dropdown-menu {
+  background-color: #fff;
+  border: none;
+  border-radius: 4px;
 
-      .name {
-        display: inline-block;
-        font-style: italic;
-        padding: 1px 2px;
-        margin-right: 1em;
-        border: 1px solid #6cf;
-        border-radius: 4px;
-        font-weight: bold;
-      }
+  li.textcomplete-item {
+    padding: 0.5em 1em;
+    border: none;
+
+    &.active, &:hover {
+      background-color: #6cf;
+    }
+
+    a {
+      color: #000;
     }
   }
 }