Generate context. script conditionally, baed on the orchestration context
Simplify contextualization script

The dependencies installed by the script are now assumed to
be pre-installed on any image that will be used as an Orchestrator.

The same idea will be followed on handling the Build Image functionality.
Add first VM recipe.

The idea is that we take default ~Okeanos system images and enhance
them in order to be useable from SlipStream. Thus, we have taken
the respective installation code out of the SlipStream ~Okeanos
connector.
Orchestrator and non-orchestrator nodes run custom script
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