rf: rename to ttl
update readme
add: initial doc on prov import
add: prefixes and imports
add: allow catalog file
add: example serializations
fix: ni-o.owl deleted in upstream/master and modified in HEAD.
add: dicom terms as data properties
add: dicom namespace and replace neurolex URI
add: temporary title and date
upd: extracting terms from nlx
add: IAO_0000115 definition
Merge pull request #4 from nicholsn/enh/dicom-mappings

WIP: DICOM Vocabulary