add jquery-atwho-rails gem
include jquery-atwho to applications.js/css
add issue number autocomplete for textareas
fix syntax error in journals notes_form
don't die if there is not data-wp_autocomplete_url and also search words in wp subjects
adapt autocomplete styling to openproject theme
let the at.js textarea autocompletion look like the usual work-package auto-completion
do not sort auto-completion results, they are already sorted
Merge remote-tracking branch 'origin/dev' into feature/issue_autocomplete
add changelog entry
Merge branch 'dev' into feature/issue_autocomplete

Conflicts:
	doc/CHANGELOG.md
Moves some search tests to spec
Adds spec
Fixes missing work package url
Adds changelog entry
Merge pull request #747 from opf/fix/search_work_package_result_link_3303

[FIX] Search work package result link
Fixed parent attribute error message
Reverts 687db52 for projects controller test
allow writing planning elements' status_id
remove obsolete planning_element_status_id