Obtaining places near search location

* still need to work out testing
changed form to show params with symbols
added route for create errand
create factory for errand
refactored getting coordinates to accept only one address. Trello #54
Errand needs its own coordinates model
ErrandsController#create: user can choose an errand

* retrieving coordinates, saving errand
ErrandsController#create: trello #45

* only one test truly required
* team decision: there's no scenario for an errand not being
  saved, so it's not accommodated.
Reconciling different version of specs/controllers/options_controller_spec.rb
Merge pull request #27 from LightningLord/errand-create

Errand create