Corrected some errors in API work package representer

Conflicts:
	lib/api/v3/work_packages/work_package_representer.rb
Show assignee & responsible in the WP detail overview

Conflicts:
	app/assets/javascripts/angular/work_packages/controllers/work-package-details-controller.js
	lib/api/v3/work_packages/work_package_representer.rb
	public/templates/tabs/overview.html
Added some properties to the API user representer
Added API show user endpoint

Conflicts:
	lib/api/v3/root.rb
Added links and embedded resources to the work package API resource

Conflicts:
	lib/api/v3/work_packages/work_package_representer.rb
Got rid of some inline WP properties
Got rid of authorization for show user API endpoint
User absolute namespacing for all API class
Fixed API work package representer spec
Add a user field partial for the embedded wp details view
Fix user fields on overview tab after API changes
Merge branch 'dev' into feature/api-create-user-show
Merge pull request #1556 from opf/feature/api-create-user-show

Feature/api create user show