[bug 949461] Hack spam delete link

This makes it easier to delete a batch of spam from the spam duplicates
report (ab)using the existing admin tools.
[bug 949461] Add delete link to response details page

This is quick'n'dirty. We should build better things later.
[bug 949461] Wrap links in superuser check

It can only be used by a superuser, so might as well wrap it in a check
and not confuse everyone else.
[bug 977124] Validate email field
[bug 991265] Update elasticutils, add elasticsearch-py
[bug 991265] Add urllib3
[bug 991265] Fix everything to work with elasticutils-py
Clean up .gitmodules
Tweak text on running tests with the right flags