improves duplicate detection

Instead of searching for a suffix of the repo NSString, I look to see
if a substring exists.
Fixes #37
Updated images and downsampled from retina.
Preparation for version 1.0.1 bugfixes.

Remove "-beta" before releasing.
Merge pull request #51 from lindegroup/doc-and-screenshot-update

Updated images and downsampled from retina.
Started work on fixing the install pane and removed references to old scheduleMatrix IBOutlet.
Changed deployment target to 10.7 and added better error handling to keychain code.
Changed deployment target back to 10.8 because one of our dependencies (MailCore2) is not compatible and caused the build to fail.
Added "check now" option to menu.
Added an additional check to prevent sending nil to the SSKeychain passwordForService method.
Created new checkNowFromMenu method.

Allows immediate checking from menu bar, even if configuration window
is closed. Thanks @futureimperfect.
"Quit AutoPkgr" to be more specific.
Using constant for app name in Quit menu title.
Merge pull request #54 from lindegroup/check-now-in-menu

Added "check now" option to menu.
Less alarming log output for normal errors.

Addresses #55.
Merge pull request #56 from lindegroup/friendly-log

Less alarming log output for normal errors.
Merge pull request #57 from lindegroup/improved-dupe-repo-detection

improves duplicate detection
Going back to using NSFileManager to check for executable rather than using 'which' because that wasn't causing the problem.
Install Git/AutoPkg buttons are now disabled/enabled depending on whether the tools are installed or not. Also updating button label to Installing... during installation.
Merge pull request #58 from lindegroup/install-pane-improvements

Install pane improvements
Merge branch 'master' into merge-remove-save-and-close

Conflicts:
	AutoPkgr/LGConfigurationWindowController.xib