Added null object to Task
Moved and added to ProgramFragment strings
Moved the tag package to a new "common" lib

The common lib will be used by most of the components of the system, but
client-side components and server-side components.
Updated tags to be serializable
Updated settings view to disable bluetooth options if bluetooth is unsupported
Updated program view to handle unsupported bluetooth

Hides the lookup button if bluetooth is not supported
Implemented initial bluetooth lookup

Optimizations and handling of turning on bluetooth still need to be
done, but the lookup via bluetooth works.
Removed Android Bluetooth client prototype