add cross-web shared cache for uglifyjs results
add cross-web shared cache for uglifyjs results

cacheid is based on md5 of file contents so different versions should be supported without problems

yacon/koala-framework,koala-framework/koala-framework,nsams/koala-framework,nsams/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,yacon/koala-framework,yacon/koala-framework,nsams/koala-framework,koala-framework/koala-framework