enable update of ACLs.
Merge remote-tracking branch 'origin/master'
improved HTTP error messages ExpectationFailed => InternalServerError
minor improvement in Scala match statement
return 401 when can't authenticate using x509 cert - arguable
minor improvement on error message for 401
fixes Issue #32: fix relative URI in SPARQL Update
Update card to add type: a foaf:Person
simplify build
fix build
Update README.md

simplified build process
Update README.md

minor fix in doc
fix link
pointer to brew
moved documentation to wiki
fix link