iPad layout improvements

[retsohuang]

LTPasscode view controller should carter it's views when presenting on iPad (like iPad's lock screen).
And add orientation support.

[bvallelunga]

Its cool, I appreciate all the contributions!

[retsohuang]

I'm working on support for iPad (Need LTPasscode centred on iPad) ,let me know if you have any idea.

[bvallelunga]

i would use constraints or you can manually calculate