Added datastore property to registeredDryModels in order to

be able to remove the model from registeredDryModels
so we can avoid registerDatastore to throw "Consitency violation" error
if you need to reinitialize waterline.
please see balderdashy#467 for more
information

lib/index.js

@@ -343,6 +343,7 @@ module.exports = {
               attributes: phModelInfo.definition,
               tableName: phModelInfo.tableName,
               identity: phModelInfo.identity,
+              datastore: datastoreName,
             };
 
             // console.log('\n\nphModelInfo:',util.inspect(phModelInfo,{depth:5}));