Or remove it where not needed

Validation fails because there is no user set.

Return in scope fails with `LocalJumpError: unexpected return`

Also remove some unused html responses

The hashes don't work properly with rails 5, there are different classes
loaded when called from the rails engine with missing inheritance.

Also the hashes never worked well with spring.

ActionController::Parameters no longer inherits from HashWithIndifferentAccess

There were validation errors because `answer.poll` wasn't set.

Needed for `assigns` in controller specs

Used `rails app:update`

Hide 'Sign in' header link on the connection page

Improve adding posts to stream

Call autosize when changing input via markdown editor