Eigen fails to checkout tag
Eigen git tag which was currently used (e81ac4502ebbfde43a1e1761b36853d3ead47c33), can not be checked out anymore as of Sunday, January 29 2017 for unknown reasons, causing all builds on the dashboard to fail:
http://my.cdash.org/index.php?project=iMSTK&date=2017-01-29
fatal: reference is not a tree: e81ac4502ebbfde43a1e1761b36853d3ead47c33
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