Modify association_proxy's method_missing to allow for scopes.
update comment
Need to extract parents primary key if its in the collection path
variable scope fix
Her::Api::request will strip out params that start with a leading _. Take advantage of the fact when using scopes on associations to prevent the parent id from bing in the params.
Merge pull request #1 from dturnerTS/scopes_on_associations

Scopes on associations