+2015-02-27
+ * fixed using "background.TOOLBOX", which was simply ignored before
+
+2015-02-23
+ * added key pad '-', '+' and '0' keys to zoom function in level editor
+ * changed editor key shortcut for undo/redo to 'u' and 'Shift-u'
+ * fixed using 'PageUp' and 'PageDown' keys for element list in editor
+
+2015-02-21
+ * added 1%, 2% and 5% to volume controls for sound and music settings
+