Proper and consistent use of `path.extname`
contents can be falsy (empty string). Fixes #32
On windows, the file path contains back slashes

Ensure that resourceURL is transformed to replace back slashes with
forward slashes
Fixed Server Tests to run on Windows
Windows tests ftw
Only replace when necessary. also test
Update sane for proper windows support.
release v0.2.0
Merge pull request #36 from jeromegn/patch-1

Proper and consistent use of `path.extname`
Update sane
Merge branch 'master' of https://github.com/facebook/fb-flo