Use single quotes around the version number so that it gets printed nicely.  Use double quotes in comparisons.  Refine error messages.
Use single quotes around the version number so that it gets printed
nicely.  Use double quotes in comparisons.  Refine error messages.

tiborsimko/invenio,tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio