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This also adds a PRESUBMIT.py, which will run on a commit and warn the committer if the docs need to be regenerated. This only runs if the html_dart2js, et. al. files have been modified. Review URL: https://codereview.chromium.org//13251005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@20820 260f80e4-7a28-3924-810f-c04153c831b5