Remove item addition from rental creation form and style date selector field
Simplify rental creation form to only contain the header data; implement client search without JS
Create scaffold for process-item-cost calculation model with maximum simplicity.
Upgrade to Rails 3.1 and start moving rental aspects into own engine. WIP
Merge branch 'master' into unified-process-items

Conflicts:
	app/helpers/application_helper.rb
	app/views/user_sessions/new.html.erb
Move admin interface into own engine
Remove obsolete assets; update layouts (not finieshed yet) Allow overwrite of commercial process implementation in engines
UI translations and date formatting
Use application layout by default for all resources; implement 'searchable resource' feature
Some random UI improvements
Merge branch 'unified-process-items'

Conflicts:
	app/views/products/_form.html.erb
	app/views/rentals/edit.html.erb
	app/views/rentals/new.html.erb
	app/views/rentals/packing_note.html.erb
	app/views/sellings/packing_note.html.erb
	app/views/user_sessions/new.html.erb