rename to hashtag instances

one might otherwise think each row is a unique hashtag.
remove log messages
add MessageManager configuration class
Log.e yo.
provide geolocation persistence

this is intended to eliminate the need reverse geocode the same coordinates over and over again.
add AsyncGeocoder submodule
create DisplayLocation from Geolocation object
AsyncGeocoder requires min sdk 10. No reason to support 3 anyway.
perform all location lookups in MessageManager
provide method for saving and retrieving DisplayLocationInstances
whoops, we need this AddressUtility from AsyncGeocoder