Compression breaks CSS

[bluemoehre]

I noticed when enabling "Compress CSS output" all calc-statements are broken.
E.g.:
width: ~'calc(100% + @{gridSpace})'; becomes
width:calc(100%+20px); which - for some reason - is no more a valid value.
At least Chrome and Firefox expect to keep whitespaces between operators and operands, so expected result must be:
width:calc(100% + 20px);

[bluemoehre]

There was a bug in yuicompressor, which I fixed (yui/yuicompressor@98341fe). Can someone upgrade this plugin to use the newer version?