Throw report-a-problem form onto layout
Add new slimmer header identifying page owner
Add new slimmer header identifying the application

This is used by slimmer to set the source parameter in the report-a-
problem form
Update slimmer to 3.18.0

This is needed for the new application_name header
Styling for report a problem form
Add feedback form to detailed guides & html versions
Merge pull request #638 from alphagov/feedback

Report a problem form

https://www.pivotaltracker.com/story/show/47732031