Add container as a dependency in the old-router package.

The ember-old-router build does not work because ember-runtime tries
to load the container module.  I tried moving the container module
to be a dependency of the new router but this broke a lot of things.
It seems a lot easier to ust add container to old-router.
Merge pull request #1744 from shwoodard/fix-old-router-build

Add container as a dependency in the old-router package.