Revert "Merge branch 'gl-dropdown-issuable-form' into 'master'"

app/assets/javascripts/dispatcher.js.coffee

app/assets/javascripts/labels_select.js.coffee

app/assets/javascripts/milestone_select.js.coffee

app/assets/javascripts/users_select.js.coffee

app/assets/stylesheets/framework/dropdowns.scss

app/assets/stylesheets/pages/merge_requests.scss

app/helpers/issuables_helper.rb

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

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

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

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

features/project/issues/issues.feature

features/steps/project/forked_merge_requests.rb

features/steps/project/issues/issues.rb

spec/features/issues/move_spec.rb

spec/features/issues_spec.rb