Add markup and styles for split-view

- added markup and styles for the workpackage split-view
Clean up indenting and made some minor css changes of details panel.
Wired the currently availabl(not much) wp data into details view.
Sketch wiring up of work package details tabs
Use ui-sref-active to mark tabs as selected, remove hack
Add states for other work packages tabs
Hide details pane while no work package is selected
Enable toggles on list#overview ui view
Merge branch 'spike/api-hyperagent' into feature/wire-up-detail-panels

Conflicts:
	public/templates/work_packages.list.details.html
Use ui router resolve to load work packages in embedded details view
Remove a TODO and includes that aren’t needed any more
Using latest version of hyperagent.
Fix the details view toggle on wp#index
Merge branch 'feature/wire-up-detail-panels' of github.com:opf/openproject into feature/wire-up-detail-panels
Merge branch 'dev' into feature/wire-up-detail-panels
Begin wiring up the activities tab
Merge branch 'feature/wire-up-detail-panels' of github.com:opf/openproject into feature/wire-up-detail-panels
Added unstyled watchers to watchers tab.
Add activity dates to activity tab
Merge branch 'feature/wire-up-detail-panels' of github.com:opf/openproject into feature/wire-up-detail-panels