[FEATURE ember-routing-bound-action-name] Enable by default.

As discussed in
https://github.com/emberjs/ember.js/pull/3936#issuecomment-33835794 a
deprecation has been made for 1.4 (in 2ef00a2).

This will enable the feature for future canary builds, as it will be
enabled by default in 1.5.
Merge pull request #4285 from rjackson/enable-bound-action-name-lookup

[FEATURE ember-routing-bound-action-name] Enable by default.