Add relevant improvements from ember-cli 0.1.5

+ Check presence of needs in model-test blueprints before emitting [ember-cli#2829](https://github.com/ember-cli/ember-cli/pull/2829)
+ Reference app instance as application in generated acceptance-tests [ember-cli#2659](https://github.com/ember-cli/ember-cli/pull/2659)
+ Add aliases `-resource` and `-route` to the route blueprint [ember-cli#2565](https://github.com/ember-cli/ember-cli/pull/2565)