Fixed bug with generation of asset URL when running server on MS Windows.
Fixed bug with generation of asset URL when running server on MS Windows.

it used windows specific path separator \ which is incorrect for HTTP protocol, now is using / on any OS.

TimothyGu/ejs-tj,operatino/ejs,TimothyGu/ejs-tj,mmis1000/ejs-promise,xanxiver/ejs,cnwhy/ejs,kolonse/ejs,tyduptyler13/ejs,insidewarehouse/ejs,cnwhy/ejs,mde/ejs,zensh/ejs,kolonse/ejs,rpaterson/ejs,zensh/ejs,insidewarehouse/ejs,jtsay362/solveforall-ejs2