Add ShardStateServices to core (copy exists in blueflood-udp, will be removed in next commit)
Use bf-core version of ShardStateServices.
cleanup imports
Bugfix in ShardStateServices
* was not getting started properly.
make a few things public in `RollupService` and `ScheduleContext`.
Make Locator hashable

...by implementing `hashCode` and `equals`.
Merge pull request #145 from gdusbabek/move_shardstatemanager_into_core

Move shardstatemanager into core
null check in Locator.equals
Merge pull request #147 from gdusbabek/hashable_locators

Make Locator hashable
Merge pull request #146 from gdusbabek/make_a_few_things_public_in_rollupservice_and_schedulecontext

make a few things public in `RollupService` and `ScheduleContext`.