Created a show activity API endpoint
Changed some activity properties
Added spec for API activity representer
Fixed typo
Merge pull request #1548 from opf/feature/api-activities-create-show-endpoint

Feature/api activities create show endpoint
Added HTML details to the activity resource
Overview tab now renders activities as HTML
Activity tab now renders activities as HTML
Merge pull request #1559 from opf/feature/api-activities-add-html-details

Added HTML details to the activity resource
Temporarily hide disabled work package details tabs
Merge branch 'dev' into feature/tab-header

Conflicts:
	public/templates/work_packages.list.details.html