Gesture Lockscreen [1/2]

Change-Id: I370d40d47459d64adf709d4caee1c27c75922cfd

This commit is more "original" than previous ones.

Conflicts:
	core/java/android/provider/Settings.java
	core/java/com/android/internal/widget/LockPatternUtils.java
	services/java/com/android/server/LockSettingsService.java