Settings: add back SMS security limit

Limit the number of outgoing messages per every 15 minutes by
any application that sends text messages.

PS2-4: Whitespace fixes

Change-Id: Ibb61396ea9adb3f95cdbd13b91cbbc3477f6e361
Update the SMS sending limit instantly (2/2)

This commit also shortens and simplifies the preference summary text
considerably.

Patch set 2  : Slight rewording
Patch set 3  : Another minor wording change

Conflicts:
	res/values/strings.xml

Change-Id: I75394ee92fa5d85c84fa0bc32f5037afe6a8a3cd
Settings: Forward port Kill app longpress back

Based on http://review.cyanogenmod.org/#/c/27235
Original author: DaneshM

Change-Id: I6e8bfb4e7e4a35c321a01debf8fdb3a38120267b
One does not simply become a Developer

Original Change-Id: I64ab4d7ab9d8334275d2e4d493b716a8fc73ab4e

Change-Id: I5c04307d0d6fd6ccfb82b5e1b2414c4e34e2d25c