[maven-release-plugin] prepare release rodl-common-1.1.8
[maven-release-plugin] prepare for next development iteration
dArceo integraton(ResearchObject interface) implemented
preservation intefaces brushed up
Code reviewed.
Merge branch 'develop' of https://github.com/wf4ever/rodl-common.git
into wf4ever-develop

Conflicts:
	src/main/java/pl/psnc/dl/wf4ever/preservation/client/RepositoryClient.java
Added the notification service vocabulary.