update to 1.1.8.RELEASE
Fix GPMONGODB-296

Sub-criteria are now wrapped in $and or $or, if there is more than 1 of them.
This fixes queries with two ors in them.
Fix GPMONGODB-257.

New AssociationIndexer.preIndex method added, which allows embedding indices directly in the document
before it is persisted, if appropriate to the store type (useful for document databases like Mongo
or CouchDB).

Mongo tests passed, indicating no regressions. New test cases weren't possible, since there is
no way to intercept the mongo driver to ensure that only the expected persistence operations are performed.
Fix local test failure and move test to correct package
fix for GPMONGODB-288 "autoTimestamp false does not work"
Merge branch '1.x'

Conflicts:
	build.gradle
	grails-datastore-gorm-mongo/src/test/groovy/org/grails/datastore/gorm/mongo/MongoDynamicPropertyOnEmbeddedSpec.groovy