developers wanted signup

this was done on top of a2 and a3, but basically gives a page for developers to sign up to help.
@bpomerenke I changed the "comments" field to be text type.  For postgres this is the correct field type for anything longer than a trivial length (like name, email, etc).  I altered the migration in place, so you may have to rollback your last migration and then apply this new one.  Let me know if you need help.