tests for entry and coordinate area models

test for the entry and coordinate_area models.  they are far from dry. might use contexts but I don't yet see their benefit for these. recommendations appreciated!

The files I made are "entry_spec" and "coordinate_area_spec".  The others were generated by other things.
Consider the meta syntax that rspec gives you, such as `expect(FactoryGirl.build_stubbed(:entry, latitude: nil).not_to be_coordinates`