GPMONGODB-84: Collapse Configuration for Mongo

[graemerocher]

Original Reporter: kensipe
Environment: NA
Version: 1.0.0.M6
Migrated From: http://jira.grails.org/browse/GPMONGODB-84

The db configuration is grails { mongo { databaseName = "xxx" where everything else dataSource, hibernate are not structure this way. Can we please make this consistent with the rest of the file with a
mongo {
databaseName = "xxx"

instead of
grails {
mongo {
databaseName = "xxx"