Empty the search field after the user has selected and displayed an article.

Fixes #37

index.html

@@ -122,7 +122,6 @@
                     <ul id="titleList" class="list-unstyled">
                     </ul>
                 </div>
-                <br />
                 <div id="readingArticle" style="display: none;">
                     Reading article <span id="articleName"></span> from dump... Please wait <img src="img/spinner.gif" />
                 </div>

js/app.js

@@ -246,6 +246,7 @@ define(function(require) {
         findTitleFromTitleIdAndLaunchArticleRead(titleId);
         var title = evopediaTitle.Title.parseTitleId(localArchive, titleId);
         pushBrowserHistoryState(title.name);
+        $("#prefix").val("");
         return false;
     }