Provoke issue described in #164 in test.
Travis: No deployment branch; test develop.ontohub.org.
We need git-svn on travis for testing of the git branch and the further releases.
Merge branch 'develop' into issue164-undefined_kind_in_entities
Add description to entities.
Allow using the ontology search as filter of ontologies
Merge branch 'staging' into augmenting276_add_descriptions_to_symbols
add logic specific parsing callback

It seems appropiate (since we will we have
a lot of logic specific parsing decisions to make) to
extract this into its own callback module. This
should prevent unnecessary cluttering of
app/models/ontology/import.rb and the
OntologyParser itself.
add empty example callback for OWL.
integrate logic-specific callbacks with import.
add decisive logic-specific pre-callbacks.
Merge branch 'logic_specific_parsing_callbacks' into augmenting276_add_descriptions_to_symbols
adjust test to match for inclusion, not equality.
parse add child-symbol hashes to parent hash.
determine whether a given axiom is an annotation.
utilize pre_axiom callback to parse descriptions.
add hets-output fixture files for Pizza.
add spec for entity-description testing.
replace entity-description with label and comment.
adjust spec for desc-label-comment-replacement.