Add angular-feature-flags

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Selectively display details view with feature flag

Integrate angular-feature-flags (there is currently no UI for
overriding feature flags).

This provides a more generic solution than 56bb307e.

As a side-effect, this fixes Bug # 8388

Signed-off-by: Alex Coles <alex@alexbcoles.com>
map subdirectory unless Passenger is used
Wired up autocomplete on sort directions and group-by select2.
Merge pull request #1398 from opf/feature/rack_subdirectory

map subdirectory unless Passenger is used
added changelog for 8421
Fade out flash messages after timeout
Fixed bug in fetch grouped queries that must have got merged out at some point.
Merge pull request #1400 from opf/feature/query-menu-styling

Add styles to selectable title query-menu
Add a configuration service
Prevent fading out flash messages if accessibility mode is enabled
Merge pull request #1401 from opf/bugfix/make-flash-disappear

Fade out flash messages after timeout
Merge branch 'dev' into feature/ng-feature-flags

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

Conflicts:
	app/assets/javascripts/angular/openproject-app.js
Merge pull request #1399 from opf/fix/8238-select2-autocompletion

Wired up autocomplete on sort directions and group-by select2.
Merge pull request #1396 from opf/feature/ng-feature-flags

Feature flags for Angular app
Fixed failing karma test in work packages table sorting modal.
Fix errors mentioned by JSHint
Cleaned up duplicated code in column sorting modal.
Merge pull request #1405 from opf/fix/8449_fix_js_errors

[Fix] 8449 Fix JS errors
specified full path to angular-truncate repo.