generate a link for each user (bug 1074518)

- [x] add in signing of state code when ready
no, ashorts code does, but Django don't care

'''
In [2]: Signer().sign(1)
Out[2]: '1:eQnFCd6tX1QuiAESMTF9BlsRVqs'

In [3]: Signer().sign('1')
Out[3]: '1:eQnFCd6tX1QuiAESMTF9BlsRVqs'
'''