fix python 2.6 compatibility
Merge pull request #26 from thehyve/improve_opal_upload

fix python 2.6 compatibility
Fixing validation of embedded vocabularies: using name instead of code for matching
Merge branch 'master' of github.com:thehyve/opal
[maven-release-plugin] prepare release opal-2.5.2
[maven-release-plugin] prepare for next development iteration
Adding EId implementation, poms and sample config. Not working yet