Precinct Service and Precincts Early Vote Sites, plus logic to detect when database
relationship creation is complete

* Fixed typo in earlyVoteSites collection name
* Added database relationships from Precincts to Electoral Districts, Polling Locations,
Early Vote Sites
* Implemented specific Precinct REST service
* Implemented Precinct Early Vote Sites REST service
* Implemented logic to determine when creation of database relationships is complete
Checking in precincts and precinct early vote sites

* precinctService:
  Precinct Service and Precincts Early Vote Sites, plus logic to detect when database relationship creation is complete