Add start and end time in activity detail page
fix the start and end time UI to be read only, and change its look
Use view helper, and also fix gist link to be nicer, while we're here
Merge branch 'master' into feature/48-add-from-and-to-times-to-activities-show-page

Conflicts:
	app/views/activities/show.html.slim
Merge pull request #34 from lighthouse-labs/feature/48-add-from-and-to-times-to-activities-show-page

Add start and end time in activity detail page