Windows support?

Is this module supposed to work on Windows? I just tried it out with [a simple Meteor 2.5.3 project](https://github.com/edemaine/meteor-solidjs-demo) and got the following error:

```
=> Errors prevented startup:

While processing files with refapp:meteor-typescript (for target
web.browser):
fs.js:1013:3: EINVAL: invalid argument, mkdir
'C:/C/Users/edemaine/Projects/meteor-solidjs-demoC:'
at Object.mkdirSync (fs.js:1013:3)
at Object.createDirectory
(C:\Users\edemaine\AppData\Local\.meteor\packages\refapp_meteor-typescript\0.3.7\plugin.meteor-typescript.os\npm\node_modules\meteor\refapp_meteor-typescript-compiler\node_modules\typescript\lib\typescript.js:7531:33)
at
C:\Users\edemaine\AppData\Local\.meteor\packages\refapp_meteor-typescript\0.3.7\plugin.meteor-typescript.os\npm\node_modules\meteor\refapp_meteor-typescript-compiler\node_modules\typescript\lib\typescript.js:7434:220
at ensureDirectoriesExist
(C:\Users\edemaine\AppData\Local\.meteor\packages\refapp_meteor-typescript\0.3.7\plugin.meteor-typescript.os\npm\node_modules\meteor\refapp_meteor-typescript-compiler\node_modules\typescript\lib\typescript.js:18200:13)
at ensureDirectoriesExist
```

The path `'C:/C/Users/edemaine/Projects/meteor-solidjs-demoC:'` doesn't look well-formed, like Windows disk names (`C:`) aren't supported.

Reproduce the failure with the linked Meteor 2.5.3 project on Windows and inspect the path handling around the TypeScript compiler invocation shown in the error. Done means Windows drive-letter paths are handled without producing the malformed `C:/C/...C:` path and the example project starts successfully.

Written by the indexing model from the issue text.