Updated models, load file and api

Added three new models for parking spot types, parking lot lines and call boxes. Created the load file to loade the shapefiles for the new models. Also updated the api views, api urls and serializers to include the three additional models. Updated admin to include the new models. Still working on the call box load. Currently trying to figure out how to load the points from the shapefile.
Merge pull request #1 from wc351/development

Merge project to mine
Merge pull request #33 from crlyli/development

Creating a pull request for additional load files