Add dir option
Add dir option

krazylegz/grunt-cache-bust,ieb-josh/grunt-cache-bust-key,bhaskarmelkani/grunt-cache-bust-lazy-loading,tusbar/grunt-cache-bust,cgrail/grunt-cache-bust,bhaskarmelkani/grunt-cache-bust-lazy-loading,mbenna/grunt-cache-bust,bhaskarmelkani/grunt-cache-bust-lazy-loading,tusbar/grunt-cache-bust,ieb-josh/grunt-cache-bust-key,dukai/grunt-cache-bust,cgrail/grunt-cache-bust,cgrail/grunt-cache-bust,krazylegz/grunt-cache-bust,krazylegz/grunt-cache-bust,yu521088/grunt-cachebust-plus,hollandben/grunt-cache-bust,dukai/grunt-cache-bust,mbenna/grunt-cache-bust,dukai/grunt-cache-bust,mbenna/grunt-cache-bust,clarkfbar/grunt-cachebust-plus,hollandben/grunt-cache-bust