Merged revision(s) 1480911 from lucene/dev/trunk:
LUCENE-4993: Fix BeiderMorseFilter to preserve custom attributes when inserting tokens with position increment 0.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1480912 13f79535-47bb-0310-9956-ffa450edef68