Added a menu item tile. Will need more of these.

- Tile is not a good size currently. Will need to make a new one.
- Might be good to make a mockup of the menu screen.
Made menu mockup and used just one sprite for the menu.

- Not sure why I was trying to do each piece of the menu as its own
  sprite. I'm gonna leave the in the old stuff in case I find there
  was a good reason for it.
Add menu sprite that contains the whole interface.

- Add sprites containing parts of the menu, not sure why I was doing
  things this way, but committing them in case there was a reason for
  this and I just forgot. See commit 8becc50.
- Delete menu sprites that were not the right size.
- Add psds to local folder and a .gitignore to ignore them.