Add Recap Capfile

We had to change the application name from 'video'. Running `cap
bootstrap` attempts to create a group with the same name as the
application but Ubuntu already has a builtin group named 'video' which
resulted in an error. We've gone with 'video_app' as it matches the
module name (`VideoApp`) of the Rails app.

We've used this Capfile to successfully deploy to our existing Linode
instance.
Add Apache config and related Cap tasks

The Apache config and related Capistrano tasks have been taken from our
site repo[1] and modified appropriately.

[1]: https://github.com/freerange/site