Update less to version 2.1.1

[p2kmgcl]

No description provided.

[guybedford]

Thanks for the PR! Have you tested this?

[p2kmgcl]

I tested it's general behaviour in a project I'm developing right now (loading files and importing with @import directive). If you have any standard test give it to me and I'll try :-)

[guybedford]

The basic tests I do are to open test.html in the example/www folder and ensure all the styles are loading.

[p2kmgcl]

I copied the stylesheet to my project and works perfectly (also loading the image).

[guybedford]

When I open www/test.html with this version, I get Unexpected token _, which is fixed by this PR I sent - less/less.js#2315.

[guybedford]

Note also that the less.Parser has been deprecated in 2.0 so that this still won't work with that fix.

Perhaps we could do something else like injecting <link> in the head that is less, or using an injection API for less somehow. Ideas welcome for how to do this.