Allowing nested resources to be defined once, include=foo.bar will alias include=foo,foo.bar

Signed-off-by: Ben Corlett <bencorlett@me.com>
Add tests as proof of concept.

Signed-off-by: Ben Corlett <bencorlett@me.com>
Merge pull request #3 from php-loep/feature/nested

Allowing nested resources to be defined once, include=foo.bar will alias...