E-mail for poll type needs to include a link to the message

[mvl22]

According to
https://camcycle.cyclescape.org/threads/227#message_70529

the e-mail that goes out for a poll doesn't actually include a link to it.

[nikolai-b]

https://www.staging.cyclescape.org/rails/mailers/thread_mailer_mailer/new_poll_message

Like all new notifications the footer contains

From Cyclescape discussion thread.

with a link to the message. This is what we do on other message types, would you like poll to do something different or should we change the footer?

[mvl22]

I think on this specific case, we should repeat the link in the body of the message - it feels a bit odd otherwise to have a poll which is just text.

Add something like:

Vote at:
<link-with-#message-id>

after the options.