* tools/examples/svnlook.py
  (SVNLook): Convert the 'rev' parameter to an integer so it can be passed as a
    string. Make the diff/changed/dirs-changed commands work on rev 0. Tweak the doc
    string.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1541873 13f79535-47bb-0310-9956-ffa450edef68