Update eclipse_rev to latest.

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@38733 260f80e4-7a28-3924-810f-c04153c831b5
Preparing versions to release polymer 0.12.0

R=jakemac@google.com

Review URL: https://codereview.chromium.org//423233004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@38734 260f80e4-7a28-3924-810f-c04153c831b5
Adding an aggregate transformer example to barback. Also updating the previous examples.

BUG=

Review URL: https://codereview.chromium.org//429943004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@38736 260f80e4-7a28-3924-810f-c04153c831b5