Add The Portal to Texas History

- Add texas profile
- Use remove_key_prefix method in mods_to_dpla and oai_mods_to_dpla
- Handle OAI-PMH/error in ListRecords response
- Add texas_enrich_location module
- Add oai_untl_to_dpla module
Update couch.py to not iterate over all DPLA database ids
Restore UVA fetcher tests
Merge branch 'release-v10.2'