importing of imported onlogies(not Working)
Merge branch 'staging' into 441-import_single_ontologies_with_imports_correctly

Conflicts:
	app/models/ontology.rb
move iri_for_child to ontology for interpretating importet ontologies
preparing seeds for imported ontologies
Imported ontologies will be created

Imported ontologies will be created but not
correctly
introduce is? method for logictype and use it.

Conflicts:
	app/controllers/entities_controller.rb
	app/models/ontology.rb
	app/models/ontology/entities.rb
	app/views/entities/index.html.haml
fix logic.name pitfalls (by using to_s).
switch call of is? on logic to ontology.
last error at generating the links
add alternative iri model
add untracked files of new model
generate the name of an ontology out of the iri.
Merge pull request #510 from ontohub/484-nil_handling_for_logics

484 nil handling for logics
test against ruby-head
allow non-existent ontology when finding with iri.
add code to maintain the external repository.
add save-file method to w/o version-generation.
add referenced ontologies into external repository.
add versions for referenced ontologies.
Merge branch 'staging' into 441-import_single_ontologies_with_imports_correctly

Conflicts:
	app/controllers/entities_controller.rb
	app/models/ontology.rb
	app/models/ontology/entities.rb
	app/models/repository/git_repositories.rb
	app/views/entities/index.html.haml
	lib/parsing_callback.rb