Merge branch 'stable-2.11'

* stable-2.11:
  Update 2.11 release notes
  Fix minor bugs in ChangeHookRunner
  RebaseDialog: Organize imports
  Force javac to use -encoding UTF-8
  Fix NullPointerException when executing query with --comments option
  Remove '--recheck-mergeable' option in 2.11 release notes
  ReceiveCommits: Fix NPE when pushing to refs/changes/n
  ChangeControl: Optimize creation by not re-reading changes

Change-Id: Iab97e14b80b1867f785034544ecb33bb39aab2ef