Added Helios requirements
Merge branch 'master' of https://github.com/ofirr/OpenCommunity

Initiating the shultze app for ordered voting
Initiating shultze support for ordered voting
Added support for Schultze voting with Django table model graph structure and support for automatically adding new issues to the graph
fixed IssueGraph.get_edges_dict() to return issue ids instead of issuenode ids
Added some testing functions
Merge branch 'master' of https://github.com/ofirr/OpenCommunity
added tests for vote reversal and recreating Itamar's tie breaking bug
updating tests and head modifications
Added custom tie breaker support, rated-order output and matching tests
added comment on ambiguous exceptions
merged with latest
removed venv files I accidently commited
added default value to prev_vote parameter in  issues.shultze_vote.user_vote
added bottom up running sum as a rating function for shultze rated orders
Merge remote-tracking branch 'upstream/master'
added normalization function for botom up rated candidates
added a function to extract guests emails from guests text field
prevent chairman vote on previously board-voted proposal

handle error condition in the client js
cleanup