Format back to 2 spaces for now, merging back from Activiti 5 is really an issue with spacing differences

- Introduced AbstractEntityManager as parent class for all EntityManager classes (and removed methods from AbstractManager)
- Introduced new getList method on AbstractEntityManager, that replaces data from the db with data in the cache (which can be more up to date) for correcter results

Refactoring DeploymentCache: introducing DeploymentEntityManager and DeploymentManager. Made DeploymentCache an interface for pluggability

history reporting done from withing the engine

ACT-1293: SQL query extensions for HistoricProcessInstance, HistoricActivityInstance, HistoricTaskInstance

ACT-766 Querying tasks causes HistoricTaskInstanceEntity to be loaded for each result and ACT-735 Task owner is not stored on the HistoricTaskInstance

ACT-741 refactoring persistence: refactoring IdentitySession and Tasksession into appropriate entity based XxxxManagers

ACT-70: Reviewed coverage of Identity, Manegement and RepositoryService + detailed API coverage/docs of IdentityService