God configuration improved

Replace subshell by Sidekiq process and terminate god after deploy:update.
Fixed indentation.
Merge branch 'staging'

Conflicts:
	config/deploy/god.rb
god recipe fixed
Merge branch 'staging'
Merge branch 'staging'
Merge branch 'staging'
Improved ontology formality levels
removed ontology type distributed ontology
Fixed syntax error regarding to formality levels in settings.yml.
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