Password Reset

[Luke Horsley]

For registered users, they need a reset password link, this should appear on the sign in page.

The steps should be the following:

1. User clicks 'reset password'/'forgotten password?'
2. New page where user enters email address
3. Email sent to use with a reset link (link should contain a code which exists in our database)
4. Clicking the link should open a page where the user can enter a new password

[Luke Horsley]

Resolved in commit e13904a.