use jsxhint instead of jshint

.jshintrc

circle.yml

lint_js.sh

package.json

...ntend_client/app/query_builder/database_selector.react.js

...es/frontend_client/app/query_builder/date_filter.react.js

.../frontend_client/app/query_builder/filter_widget.react.js

resources/frontend_client/app/query_builder/header.react.js

...s/frontend_client/app/query_builder/query_picker.react.js

resources/frontend_client/app/query_builder/saver.react.js

...ontend_client/app/query_builder/selection_module.react.js

.../frontend_client/app/query_builder/visualization.react.js