Fix location geocode check.

Fixes issue where MAP button at top of location view crashes.
Note required Google APIs in README.

Closes #52; closes #53.
Do nothing on current location marker popup tap.

Also refactors map fragment for simplification.
Add tests for election admin body functions.

Also fix location description fetch.
Merge pull request #54 from flibbertigibbet/feature/fix-location-check

Fix location geocode check.