Node spawn causes issues with Windows. Replace with cross-spawn. #130
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Should fix #121.
The errors stem from node's child_process.spawn ignoring PATH_EXT in Windows. See more details here: nodejs/node-v0.x-archive#2318. Replacing the native spawn with cross-spawn fixes these issues and is a more portable way of approaching the problem than attempting to append the appropriate extension to the preprocessor depending on the environment.
NOTE: On older versions of node (I believe < 0.12) this non-breaking warning comes along with cross-spawn: