Created custom routes for final trips

  *post /trips/finalize
  *get /:url
  *also deleted empty routes_spec
Implementing Finalize Trip Feature

  *Added a button on button show page that posts
  *Added finalize action which creates a secure url
  *Added blank summary action and views
Implementing Trip Summary View

   * summary page is displaying trip info
   * wrote helper methods to format the durations for the ueser
   * fixed routing error bug
merged master
two trip model specs passing
Controller tests for #finalize passing
  *expect it to set a secure url
  *expect it to redirect
Merge pull request #28 from LightningLord/finalize_trip

Finalize trip
Merge branch 'master' into db_duration
Renaming Errand property from additional_duration to delta_duration

* consistent with concept being used: a calculation
* all specs pass