[FEATURE ember-routing-auto-location] Enable by default.

This feature was given a 'Go' in the core team meeting today
(2014-01-31). As such it should be enabled by default for all future
canary builds. This will help ensure that it has more review prior to
shipping the 1.5.0 beta series.
Merge pull request #4278 from rjackson/enable-features

Enable ember-routing-auto-location in canary.