URL Field - pure Angular directive and l18n values

- Commenting out jshint fail report in gulp task so that the reg exp used in URL Field directive can remain on one line
- Modified dtv-url-field.js to now be a pure Angular directive and not wrap the jQuery plugin
- Added URL Field HTML template for Angular cache
- Updated en translation.json with URL Field values
- Removed an e2e test that checked for default value, now using a placeholder value instead