Introduced taskController,

which will be used to control a single task.
Added getTask element to taskController.

It should be a function, but isn't yet. More tests are required.
Made getTask a function.
Assigned task property to result from gateway.
Changed getTasks function to return array,

instead of a more complex object with only one property, as this seemed
redundant.
Introduced getTask member on taskGateway.
Made getTask a function.
Changed route to use new taskController,

although it doesn't have any effect yet, since the template doesn't use
any data from the controller.
Called getTask upon creation of taskController.
Wired single task page up to scope.
Renamed 'opgave' route to 'task'.
Renamed 'opgave' template to 'task'.