Replace old version IRI with a new one to invalidate actions in progress
using the previous version IRI (unless the user forces an update anyway)
Modify method in UnmanagedArtifactIRIException to be similar to
UnmanagedArtifactVersionException
use internal artifact instead of parameter after it is fetched
add more tests for updateSchemaImports to verify owl failures and
successes as necessary
Merge remote-tracking branch 'origin/master'