feature: one vote per user per poll

Calum Mackervoyrequested to merge
5-limiting-votes into master

Closes #5 (closed)

  • Overriding Vote view_set to prevent duplicates being POSTed
  • Providing custom view at url /polls/(?P<pk>[0-9]+)/can_vote/ for GET - can I vote? Returns True if I can, and False if I can't
  • Test suite
Edited by Calum Mackervoy

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