Improve url comment placement when embedding images as base64 dataUri
When using the 'Embed as base64 dataUri' option, it places the preserved comment containing the original url string after the embedded base64 data.
The code would be more readable with the original url string placed before the embedded data e.g.:
background-image: /*Images/image.png*/ url('data:image/png;base64,iVBOR...')
Currently, in VS2013, if the commented url string is manual re-positioned before the embedded data, it prevents the 'Re-embed dataUri from ...' option being used.