restructure directory tree

[ThePeach]

after transitioning under Yii it's needed a little bit of rearranging of the directories previously laid down.
the original situation was:

• gallery/
• images/
• includes/
• settings/
• index.html

now everything should move inside the proper directories structure provided by Yii

[ThePeach]

partially done, now the only two things left are the "gallery/" and "themes/" directories