Updated project to work with mapbox.

Installed django-geojson. Added geojson to requirements. Created url, view and template for map hosted from Mapbox.  Created  GeoJSONLayer urls for person and marker. Added Mapbox to map template and loaded markers with popups using mapbox.js. Update navigation bar in base template to include link to map template. Updated button in carousel with link to map template. Also updated test for two geojson urls and map url.
Altered case of secret key.
Merge pull request #17 from jzmiller1/map_fb

Initial implementation of cemetery web map.
Merge pull request #18 from jzmiller1/data_fb

Updated initial data fixture and models.
Altered model and updated initial data fixture

Changed the maximum length of characters on the marker model family name field. The field was not large enough to hold some of the markers added to the database. Also created an additional initial data fixture to only include the cemetery name and description. We wrote script to load data from shapefiles but data included in both the shapefile and the initial data fixture were repeated twice in the database.