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Use ARC
DP3 compatibility
Adding Xcode 5 GM compatibility UUID, recommended XC5 project settings.
removed compatibility specs
removed leftover backporting stuff
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Fix crash when clicking the preview icon.

For some reason the NSPanel was autoreleased after being loaded from the
nib. Fixed it by using `[NSWindowController initWithWindowNibName:]` instead
of loading the nib by hand in `mainWindowInBundle:`.
Upgrade PluginWindow.xib to Xcode 5 format

Note that this will prevent the xib to be edited in Xcode 4.x
Link the window outlet the file's owner (ATZPluginWindowController)
Merge pull request #80 from guillaume-algis/issue79-preview-icon-crash

Fix crash when clicking the preview icon. - Related to issue #79
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Update .gitignore with new Xcode5 files
cleaned some tests
cleaned up some unused stuff
added some resources. pretty broken atm.
fixed resources
Removed GC flag
replaced default horizontal lines with fabio's idea. constraints are screwed up
fixed constraints a little bit. still not perfetto