Add jquery_ujs.js 3.0.4.

The minified js and sourcemap were created with commands:
brew install closure-compiler
closure-compiler \
     --js jquery_ujs.js \
     --create_source_map jquery_ujs.min.map \
     --source_map_format=V3 \
     --js_output_file jquery_ujs.min.js
echo '//# sourceMappingURL=jquery_ujs.min.map' >> jquery_ujs.min.js