added tests to whether a user can see participant emails and changes all cases where the email is displayed to be their study id
[Finishes: #70464970]
improved how roles get added to users to be more easily readable
allow memberships to be added with American style dates [Finishes #70805696]
able to get spec test to pass
fixed 'active' scope in memberships [Finishes: #70957790]
removed email from membership
Changes to CenterIt.js in order to prevent footer intersecting content
updated thought view to be section 1 of Think [Finishes: #70956318]
commented out temporarily bc of failing tests
Changes to table styling to prevent tests failing.
Added an if statement to center function to prevent larger sized elements getting pushed to the top