Fix old student members coming back with the same student id after thier account has been deleted and they paid via the su

Beta hasn't exploded, lets push these to live

See merge request !55

Fix signup validation. Emails, names and addresses are now much less strict, and more valid postcodes are allowed.

Kit Manners authored Sep 26, 2017 and Imran Hussain committed Sep 27, 2017

Fix signup validation. Emails, names and addresses are now much less strict, and more valid postcodes are allowed.

Tidy up branches (1/3)

See merge request !69