Added support for a registry file to provide for multiple database sources, e.g. staging1 and 2.
Added support for a registry file to provide for multiple database sources, e.g. staging1 and 2.

Ensembl/ensembl-production,Ensembl/ensembl-production,markmcdowall/ensembl-production,Ensembl/ensembl-production,markmcdowall/ensembl-production