ability to insert uppercase color names

[wareczek]

No description provided.

[deviprsd]

In browser the uppercase are automatically converted to lowercase, there won't be any difference between #FFFFFF and #ffffff

[wareczek]

If you using less in JS code try to do that:

less.tree.Color.fromKeyword('White')

or that:

less.tree.Color.fromKeyword('RED')

You'll get null as result. Less should be sensitive for that.

[lukeapage]

If its valid css (RED) we should do it.

[wareczek]

http://www.w3.org/TR/css3-color/#html4

The color names are case-insensitive.

[lukeapage]

okay, I'm sold.

[seven-phases-max]

Btw., this is quite breaking change, it will break a code like:

@name: Aqua;

@{name} {
    /* ... */
}

I'd suggest to merge #1604 then (I've just added case-insensitivity there) since it becomes to be less breaking than this one...