Implemented REST service for precinct electoral districts
Implemented REST service for precinct polling locations
Implemented Precinct Splits for Precincts service

* Added precinct splits and street segments to precinct database model
* Added precinct splits REST service
Added Street Segment REST service for Precincts
Merging in precincts REST services

* precinctService:
  Added Street Segment REST service for Precincts
  Implemented Precinct Splits for Precincts service
  Implemented REST service for precinct polling locations
  Implemented REST service for precinct electoral districts