Adding option to clear uicache on install

Hi,

I have added an option to clear the uicache (display new installed applications on springboard without a respring). I have observed, that (at least on iOS 7) a respring does not always show new installed applications. Executing uicache from the uikittools packages resolves this problem.

Please find also the updated wiki pages:
https://github.com/tsparber/iOSOpenDev/wiki/Convert-to-iOSOpenDev-Project
https://github.com/tsparber/iOSOpenDev/wiki/Xcode-Template:-Custom-Build-Settings