Removes modal to avoid multiple clicks.

With the property 'disabled' set to true on the <a> tag,
the modal stuck around too long, allowing users to re-submit
a POST request, and falsely increment the download count
for the project.
add mailchimp mass email ID
auto-subscribe new web users to mass emails
add management command to subscribe old mass email list to mailchimp mass email list
use 'CommCare User' as first name if none is supplied
force mailchimp subscription names to title case
Merge pull request #3454 from dimagi/fix-download-count

Fix extra download incrementing in exchange.
update casexml
handle changed email for the mass email list too
fix NoneType error
fixing another NoneType error
Merge pull request #3474 from dimagi/mailchimp-mass-email

Mailchimp mass email list
Tiny cleanup
change subscribed email for Mass List independent of CommCare Users
Merge pull request #3475 from dimagi/uth

Misc UTH fixes
Merge pull request #3476 from dimagi/fix-change-email

change subscribed email for Mass List independent of CommCare Users
run secure functionality when domain requires secure submission

even when hitting the insecure URL
catch and print banned emails
Merge pull request #3478 from dimagi/subscription-errors

catch and print banned emails
Merge pull request #3477 from dimagi/redirect-secure

run secure functionality when domain requires secure submission