LockScreen: Option to hide initial page hints (2/2)

This will add an option to hide the initial page hints
that are shown left and right when the device is turned on.

Change-Id: I188bcc0b52715a56ee8b6d2fc7cc6908592cea0c
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Merge "LockScreen: Option to hide initial page hints (2/2)" into jb-mr1
added fast toggle preference

Patch Set 2: removed debug and useless code
Patch Set 3: added ability to choose between left and rigth handed usage
Patch Set 4: magically removed .classpath
Patch Set 5: go away classpath
Patch Set 6: aaand ... .classpath is gone.
Patch Set 7: I kill mysely if the classpath is still there
Patch Set 8: Rebased
Patch Set 9: The revision that never existed
Patch Set 10: Remove whitespace and hide options on tablets
Patch Set 11: Use summary to be descriptive
Patch Set 12: Rebased
Patch Set 13: add dependency in the preference xml

Change-Id: I38934a9fe764be9078814ea02462554f11d208ac
Fixed merge issue