Strips out Geonetwork resource class.
Simplified asset base class.
Adds stub for Solr class.
Basic Solr resource up and running.
Shell for create_document method.
Barebones Solr rig up and running.
In Asset intialize, query for the ESRI layer name and uuid.
Makes solr wrapper readable on loader classes.
Renames Loader -> AssetLoader.
Gets rid of old integration tests, ready for real sample data.
Revert "Gets rid of old integration tests, ready for real sample data."

This reverts commit b666a614ddfdcc758211b1b050d24edf98d332eb.
Moves to uuid-backed stores.
Basic YAML-manifest loading working.
YAML-defined batch loading working.