Calculate extra time in minutes (trello 55)

  * adding new helper for converting seconds to minutes for views
  * removing formatting chore from Business model
  * each Option will only return its extra duration in seconds
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
Implemented "Start Over" link

  *made a partial with the link
  *rendered the partial on trips/show and trips/summary
Merge pull request #29 from LightningLord/trip_tdd

Trip tdd
Merge pull request #30 from LightningLord/start_over_link

Implemented "Start Over" link
removed redundant TripsController#show method which was empty
Merge branch 'master' into db_duration

Conflicts:
	app/helpers/application_helper.rb
Changing added_duration to delta_duration
Merge pull request #31 from LightningLord/db_duration

Db duration
set and increment ending_duration properly
fixed bug in rendering maps for errands
controller test for incrementing ending duration passing
properly rendered map and directions in Trips summary view
Merge pull request #32 from LightningLord/debugging_ending_duratoin

Debugging ending duration
merged from mater
now only one start over button appears
fixed bug to show map at summary
Merge pull request #33 from LightningLord/summary

Summary
debugged summary and wrote controller tests