Add empty function to resource generator.

If we generate a resource there is a high probability that we want to
start adding routes to it too. Also it's really helpful to get the
index route by default.
Merge pull request #1817 from abuiles/expose-index-route

Add empty function to resource generator.
Add {{outlet}} by default when generating a route template.

After doing `ember g resource` the next step is normally to include
nested routes, adding an outlet by default makes sense for routes.
Merge pull request #1819 from abuiles/add-outlet-to-template

Add {{outlet}} by default when generating a route template.