remove presence of raw file/url validation

This seems to be an issue when creating ontology versions, so
according to the meetup, the validations (maybe erroneous)
validations will be removed, for now.
add simple ontology version to child-ontologies

Add simple ontology versions, that means version which
only have the creating user and a reference to the ontology.
comment ontology version validation-code.
Merge pull request #255 from ontohub/correcting162_create_versions_on_children

Correcting162 create versions on children