Rebaseline script:  check for .git and .svn in the current directory as well.  Add mesa to list of configs to update.

R=bsalomon@google.com

Review URL: https://codereview.appspot.com/6908050

git-svn-id: http://skia.googlecode.com/svn/trunk@6707 2bbb7eff-a529-9590-31e7-b0007b416f81
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