Support for srcset

[bpinto]

Hi,

I couldn't use html-loader in conjunction but given ng-cache-loader has support for resolving URLs, would it be possible to support srcset attribute too?

<img src="illustrations/hourglass.png"> #works
<img srcset="illustrations/hourglass.png"> # does not work
<img srcset="${require('illustrations/hourglass.png')}"> # does not work but would be great

[ovcharik]

See #40