return 400 Bad Request for unparseable range request.
return 400 Bad Request for unparseable range request.

git-svn-id: c1f8a8ec0b3bb2e99ab3413722f81f687760e79c@988450 13f79535-47bb-0310-9956-ffa450edef68

apache/couchdb-futon,apache/couchdb-futon