Problem loading assets from dev server on windows

[meypod]

Currently there's a serious problem on windows, which took me hours to track down and do a local fix

tl;dr: made the issue to create a PR fixing this.

The issue is that filename in assetsCache in windows uses backslashes. when the app tries to load the asset, it requests the localhost server using forward slashes, so it will miss. my quick solution to this was adding a duplicate key with slashes replaced by forward slashes and pointing to the same data. duplication was done because I do not know if the assetsCache keys are used inside production builds or not. since removing the backslashed paths would cause local file system access failure, I did not remove it. it will also simply replace the other key on unix paths.