Ignore query params when replacing URLs of revved assets

This commit enables usemin to match a CSS reference like

  src: url('fonts/myfont.woff?v=1.2.3')

against a file named 'fonts/a4ef223c.myfont.woff' and updates
the reference to

  src: url('fonts/e4ef223c.myfont.woff?v=1.2.3')

Same for query parameters in HTML tags.