Update get /data

Remove leading slash from page
Fix edge case with path set to '/'

lib/gollum/frontend/public/gollum/livepreview/js/livepreview.js

@@ -339,15 +339,22 @@ var applyTimeout = function () {
      ~-1 == false; !~-1 == true;
    */
   if ( !~ location.host.indexOf( 'github.com' ) ) {
+    
+    // returns unescaped key with leading slashes removed
+    function key_no_leading_slash( key ) {
+      return unescape( $.key( key ) || '' ).replace( /^\/+/, '' );
+    }
+    
     // ensure leading / is removed from path and that it ends with /
-    var path = unescape( $.key( 'path' ) || '' ).replace( /^\/+/, '' );
-    if ( path.charAt( path.length - 1 ) !== '/' ) {
+    var path = key_no_leading_slash( 'path' );
+    // don't append '/' if path is empty from removing leading slash
+    if ( path !== '' && path.charAt( path.length - 1 ) !== '/' ) {
       path += '/';  
     }
     
     jQuery.ajax( {
       type: 'GET',
-      url: baseUrl + '/data/' + path + $.key( 'page' ),
+      url: baseUrl + '/data/' + path + key_no_leading_slash( 'page' ),
       success: function( data ) {
          editorSession.setValue( data );
       }