v3 (1.46) : added basic UI for <4.1 ; proguard

if <API16, instantiates a really basic UI activity

added proguard to cut out unused crap from support library

tried to make sure that we remain top priority for media keys
by repeatedly requesting media key events every time through
the startService() routine

used the static isRunning boolean hack instead of searching
running activities. This should probably work, but we'll see.