first steps toward fast hets run: adding parameter fast_parse
add tests for git lib check if a file has changed
add git lib file changed checking function
add another test for git lib file changed check
delegate file changed check from model to lib
fast parse only if the ontology is not at the current state
Merge branch 'staging' into 504-hets_fast_run
..and fixed bug "Hets.parse(..., structure_only: false)"

Conflicts:
	app/models/ontology_version/parsing.rb
adding small tests for testing get_mapping_for method
Merge pull request #630 from ontohub/504-hets_fast_run

Enable structure only parsing for hets, fixes #504.
Unix line breaks, and a little refactoring.
Merge pull request #631 from ontohub/589-help_buttons_linking_to_wiki_pages

Context sensitive help, fixes #589.
add check if an ontology is imported
make user_info a function
add ability to delete a file in a repository
add destroy route to an ontology
add controller actions to delete an ontology
add button to delete an ontology to view

tooltip is not shown yet because the according bootstrap javascript is not initialized
Merge branch '398-delete_ontology_button' into develop

Conflicts:
	app/models/ontology.rb