Do not remove arbitrary quotes because of meta description

While meta tags audit we decided to port `<meta name="description" />` from WikiaMobile to Mercury. I've found out it's been there and depends on article abstract returned from API. However, there were issues with quotes and letter casing on production. The issues weren't visible in dev environment.

@hakubo mentioned about `gulp-minify-html` module which we use only on production. We decided to change its default configuration and set it not to remove arbitrary quotes which fixes the issue with meta description.