{% spaceless %} token not implemented

[mattkahl]

I've published a Gist that extends twig.js and adds {% spaceless %}:
https://gist.github.com/mattkahl/4963386

Feel free to implement if you feel the execution is up to snuff.

[justjohn]

I'll need to write a test or two to verify it, but it looks good at first glance.

Thanks for the contribution.

[justjohn]

This is in the latest 0.5.6 tag and npm release.