readdirSyncRecursive returns file names on Linux, file paths on Windows

[domenic]

This caused some problems deploying from a Windows dev environment to a Linux production environment :-/.

[ryanmcgrath]

Hmm... I don't have a VM to test on at the moment. Is this down to a platform difference in Node.js, by any chance? If so I feel like it's more of an upstream bug for them.

[domenic]

Nah, just down to using manual string manipulation instead of the path module.

There are lots of other places in the code that do such string manipulation (e.g. concatenation with / instead of using path.join), but all the tests pass on Windows now, so it seems likely they don't matter.