Closes #177: Add explicit cocoapods master repo source
Update README w/ cocoapods min version number
Closes #176: Document settings.plist defaults

Also bugfixes behaviour of the UseTestData/OfficialOnly
keys to match documented defaults
Closes #169: Disable map view and show message if no nearby locations

As requested by @jen-tolentino, the app will now hide the map view and
disable the map switcher if the selected filter type has no locations.

If in the map view and a switch to a filter with no locations occurs,
the map view will hide and disable the button.
Document electionId settings.plist parameter
Closes #167: Hide details properties if they have no value
Closes #172: Fix multiple dequeue for contest detail url cells
Bump version number to 2.0.2