Merge pull request #215 from mdijkstra/master

Merge 'compute-bash' branch in master branch.
If output path (called 'workdir') is specified in parameters.csv and has relative path, then we assume that this relative path starts at the same location as the parameters.csv that refers to it. This is consistent with what we did previously for e.g. workflow.csv.
Improved error message of validation step that is applied in each script after sourcing environment: value parameters may not contain different values
Added second demo which demos that we can also use list as output parameter
Merge branch 'master' of github.com:molgenis/molgenis