HumanTaskAgent can now accept `combination_mode` and `poll_options` which are used to generate a poll from the HITs answers.  The poll asks additional Mechanical Turk users to rate the responses, and then the best one is returned.  This allows for an additional step of validation on user generated content / data.
Merge branch 'master' into human_task_agent_makes_polls
doc
a webhook agent to create events from webhooks.
configurable webhook payload , update description, improve tests
fix spec typo
fix test logic :grin:
update dotenv-rails and attempt to make cap sync:db:down work with remote .env files
Merge pull request #117 from cantino/update_capistrano_sync

Update capistrano :sync
Merge pull request #115 from j-wilkins/webhook_agent

a webhook agent to create events from webhooks.
Merge pull request #98 from cantino/human_task_agent_makes_polls

HumanTaskAgent can now validate answers with a poll
Merge branch 'master' into do_not_symbolize

Conflicts:
	app/models/agents/human_task_agent.rb
	spec/models/agents/human_task_agent_spec.rb