enable developer options visibility by default for userdebug builds

Signed-off-by: Roman Birg <romanbirg@gmail.com>
AOKP custom system animations (2/2)

ported fom here: http://gerrit.aokp.co/#/c/12305/

Thanks to Steve Spear

Change-Id: Ibd978f0516521579e5339f21ac81a360740358e8