Added search for all lists on issue boards

app/assets/javascripts/boards/boards_bundle.js.es6

app/assets/javascripts/boards/components/board.js.es6

app/assets/javascripts/boards/models/list.js.es6

app/assets/javascripts/boards/stores/boards_store.js.es6

app/assets/stylesheets/pages/boards.scss

app/views/projects/boards/components/_board.html.haml

app/views/shared/issuable/_filter.html.haml

spec/features/boards/boards_spec.rb

spec/javascripts/boards/list_spec.js.es6