fix subpackages imports

[ivaxer]

Fix go app get error:

➜  ~GOPATH  goapp get -d  github.com/mjibson/goread
package atom: unrecognized import path "atom"
package rdf: unrecognized import path "rdf"
package rss: unrecognized import path "rss"
package sanitizer: unrecognized import path "sanitiser"

[maddyblue]

I'm not sure the current method is wrong. It's just the importer complaining that it can't find them. But consider the "appengine/..." imports there, too. Same deal with them: a local import. Leaving them like they are allows the goread code to not live in your $GOPATH, which is fine. If you can link some documentation or other source saying why it's better to use a full path for local app engine packages then I'll merge this.

[akscram]

I had tried to reproduce the installation of a local environment according the README and got the same problem. What did I do wrong?

[maddyblue]

You did nothing wrong, this is supposed to happen. I'm going to fix the install instructions to say that.