* Clean up legacy charting imports
* Update existing donut and line charts
* Create helpers for parsing out existing chart data
* Move chart partials to a more common path
The line '@users = User.all.order(:name)' is replicated a lot of times
in EventsController and ProposalsController.
So, this commit removes it and adds a helper function
'speaker_selector_input' that generates the field where the @users
variable was used.
Also, it makes the query more specific.
Fix#1455
Other changes:
* Include the username in the drop down menu
* Add .active scope to User and corresponding tests
* Add :disabled trait to User factory
The spec for omniauth doesn't test signup for every provider, and it
doesn't test if it has tests for all available providers
Also, we no longer use secrets
* Add model test to check if the omniauth providers have changed
* Test signup using every provider
* Replace secretswith environment variables
