add homebrew installed hets to search_path.
bump minimal hets working version number

Importing referenced OWL-ontologies will fail for
earlier versions.
Merge pull request #578 from ontohub/os_x_hets_management

OS X hets management
Merge branch 'master' into staging
add parameter to start script: disable rails server if -n is supplied
Save the deployed revision into file.
revert change of start script
Fix seeds for URI in name ontology field.
Merge branch 'staging' of github.com:ontohub/ontohub into staging
Pulling from remote repositories is more efficient now.

solves #598
Refactored GitRepository::GetDiff

Lazy creation of diff to increase the performance.
solves #598 and #609
fix the extraction of internal iri when parsing

Since a hets update, hets does not enclose uris
consistently in angle brackets. We need to
check for them, before stripping the uri.

Also deactivates the Reference-Node-Callback (unnecessary).
Merge pull request #613 from ontohub/fix_iri_extraction

fix the extraction of internal iri when parsing