COUCHDB-1755 notifications should take templates
COUCHDB-1755 notifications should take templates

Added the option to pass a template for custom notifications as well as
data. Data is serialized so it can be accessed in the custom template.

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb