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 an additional check to prevent sending nil to the SSKeychain passwordForService method.
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