Add quiet_assets to mute assets pipeline logging

Enabled in development environment only.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Update capybara to 2.2.1
Rename support file
Don't use let for find expressions
Refactor toggable support spec
Refactor select all link specs
Expect sort header before accessing the title
we don't need no disc for li's in wiki tocs

fixes (parts of): https://www.openproject.org/work_packages/7384
Merge pull request #1269 from opf/fix/headlines_in_wiki_toc
Add changelog entry
Explicitly enable quieten_assets in development

Improve discoverability of the configuration, in the case a developer
needs to re-enable asset pipeline logging.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Make commented spec a pending one
Extract find calls to methods
Merge pull request #1257 from opf/feature/quieten-assets-pipeline-logging

Add quiet_assets to mute assets pipeline logging
Use methods instead of let for fresh results.
Merge pull request #1271 from opf/feature/update_capybara_to_2-2-1

[Feature] 7198 Intermittent database deadlock in Work package Capybara spec
Merge branch 'dev' into dev-angular

Signed-off-by: Alex Coles <alex@alexbcoles.com>

Conflicts:
	spec/features/accessibility/support/toggable_fieldsets.rb
	spec/features/accessibility/support/toggable_fieldsets_spec.rb
	spec/features/support/toggable_fieldsets.rb