update appcompat for latest SDK/Android-L
make sure its clear which Message class we mean
new SDK had some confusion here
InexactRepeating seems to be one source of delays and oddities
Let's go back to "exact"!
OTRKeyMgr might be null if the user has not yet entered a passphrase
small updates for Android-L/Material compatibility
need to reimplement spinning indicator as its no longer support
in actionbar by default
renable debug settings for Smack
update to target android-21 to support Material
updates to support appcompat v21 and new drawerlayout/toolbar
removed external SlidingMenu dependency - only appcompat now
target 21 now to ensure Material support on Android L