Work in progress for Build Image support

Refs #4

https://github.com/CELAR/SlipStreamConnector-Okeanos/issues/4
Merge branch 'master' into issue_04

Conflicts:
	java/jar/src/main/java/com/sixsq/slipstream/connector/okeanos/OkeanosConnector.java
Build image: work in progress

Refs #4

https://github.com/CELAR/SlipStreamConnector-Okeanos/issues/4
Merge branch 'issue_04'

Merging status so far, since #4 is on hold right now.