GRAILS-10910 - clear collections when binding an empty collection to them
Use Spring 3.2.6.RELEASE
Revert "Use Spring 3.2.6.RELEASE" as it broke the functional tests. Need to look into the failures.

This reverts commit 560c4da3e75b490a3416b63287b6527c009d6f5a.
Put Spring 3.2.6 back in place
GRAILS-10908 - improve url mapping constraint handling
GRAILS-9664 - improve g:checkBox handling of nested properties

This will make the hidden form field name consistent with data binder expectations.
GRAILS-10899 - improving binding to Collection

If the declared type of a collection is java.util.Collection, its default collection type will be java.util.HashSet when the data binder needs to initialize the collection.
Revert "GRAILS-10899 - improving binding to Collection"

This reverts commit 21d6b170871c91291a46107745695630a7a7d06e.
GRAILS-10899 - improve binding to Collection
Merge branch '2.3.x'

Conflicts:
	build.gradle