2.4.4 (travis build 1876)

• #522 Fix cache race bug
  • Add version key to draftset/endpoint objects on API. This can be used downstream of drafter to help invalidate any caches clients may keep. (backwards compatible as long as clients ignore unknown keys)
  • Requires running this migration on upgrading from 2.4.3 to backfill versions
• #525 Document limitations of Drafter's SPARQL update endpoint in swagger
• #528 #527 Misc build/CI improvements
• #532 Add missing timeout parameter to swagger spec for public/live SPARQL post requests