Use ${objenesisVersion} instead of hardcoding the version as 1.4
Use Objenesis 1.4

One place used to use 1.4, the rest used 1.2. This change consistently uses 1.4.
Merge pull request #535 from candrews/ObjenesisConsistency

Objenesis consistency
Merge branch '2.4.x'

Conflicts:
	grails-test/build.gradle