Finish board matching in simplified dash_config.

Board config matching needed another layer of matching in
the config specific emailer on top of previously implemented
category and test matching.

Also fixed the utility that generates a view of the data
model for debugging issues related to the model data.

Also updated the emailer instructions page.

BUG=None
TEST=local dash email generation and cautotest dash email gen.
http://truty.i.corp.google.com/results/dashboard/emails.html

Change-Id: Ie1cd3bec6157fb8dfc00b06627292d0609a82553
Reviewed-on: https://gerrit.chromium.org/gerrit/21928
Reviewed-by: Dennis Jeffrey <dennisjeffrey@chromium.org>
Commit-Ready: Mike Truty <truty@chromium.org>
Tested-by: Mike Truty <truty@chromium.org>
5 files changed