[maven-release-plugin] prepare release jackson-core-2.4.4
[maven-release-plugin] prepare for next development iteration
Merge pull request #170 from Scytl/master

Adds head operation in JsonPointer class. Resolves issue #169.
update release notes wrt #169
tiny additions to JsonPointer, test refactoring
Fix #173
Merge branch '2.4'

Conflicts:
	pom.xml
	release-notes/CREDITS
resolves #172 by adding last operation in JsonPointer.