Moves Localizable.strings to Resources subdirectory. Refs #40.
Moves InfoPlist.strings to Resources subdirectory. Refs #40.
Moves Info.strings to Resources subdirectory. Refs #40.
Converts MainMenu.nib to Resources/MainMenu.xib. Refs #40.
Converts Playlist.nib to Resources/Playlist.xib. Refs #40
Converts Preferences.nib to Resources/Preferences.xib. Refs #40
Moves remaining resources into subdirectory. Refs #40.
Adds forgotten InfoPlist translations during move. Refs #40.
Merge pull request #43 from gradha/t40_text_nibs

Use text nibs
Fix seek button positions

- Somehow the struts for the seek buttons got unset/changed
  causing them to overlap on the right side.
Ignore .xccheckout files

- This file contains references to the origin repository which,
  with git, can be different for everyone working on the source.
- It appears to have just appeared recently.