Add the Admin area.

Also tweak the default route to set a default controller as well as a
default action.
Add a home controller and Index view.

Just enough to get going.
Add admin Layout and ViewStart.
Fix route definitions.

Define the namespaces in which the router should look to resolve
controllers and actions.
Move Concerts' administration functions to Area.

Move the actions associated with administering concerts to the Admin
area. Move the associated views too.

Update the tests by moving to a new file in a new namespace.

Set the Authorize attribute on the Admin Area's ConcertsController, not
the individual actions. Also do the Admin Area's HomeController.
Add Glimpse.
Tidy up Admin Area.

Fix comments in Concerts Controller. Rename List view to Index (and
remove List action); update matching test. Set the Administer Concerts
link to point to the Admin Area.
Fix Admin concerts controller tests.

Delete a test that is no longer appropriate. Fix the remaining
no-concerts test.
Remove the Layout definitions in the views.

These were pointing back at the Layout page in the main site, thus
breaking the rendering of the views.
Add Scripts section and Bootstrap styling.
Add styles and scripts to admin Layout.

Bootstrap responsive stylesheet, plus jQuery, Modernizr, HTML5 shim, and
Knockout.
Merge branch 'feature/admin-area' into develop