holy WIP getting close on this
getting close...I think?
moved to own spec
README addition
cleanup to shrink the diff
pulled out essentially unused namespace, since the :as option when defining fields can pretty much achieve the same thing
get rid of custom restriction (so you can just use with, or even filter joins using .greater_than, etc), plus handle local_params a little more holistically
README update
Merge pull request #470 from mikeauclair/solr_joins

Solr joins