Installation of flow-bin seems to fail in windows

[bruno-brant]

It seems that the post install event of flow-bin isn't being ran in Windows. Gulp fails with:

[20:06:02] Using gulpfile c:\Users\[redacted]\gulpfile.js
[20:06:02] Starting 'typecheck'...
events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: spawn c:\Users\[redacted]\node_modules\gulp-flowtype\node_modules\flow-bin\vendor\flow.exe ENOENT
    at exports._errnoException (util.js:949:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:182:32)
    at onErrorNT (internal/child_process.js:348:16)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickDomainCallback (internal/process/next_tick.js:122:9)

I was able to circumvent the issue by cding into gulp-flowtype and installing flow-bin.

[charliedowler]

Hi,

~~Closing the issue as I don't believe this is an issue with gulp-flowtype.~~

I'm not a Windows user nor do I have immediate access to a dev environment to debug this, open to any contributions.

Cheers

[tyger]

In the latest version flow-bin is only required as devDependency. In production mode flow-bin should be installed as peerDependency by user manually.

@charliedowler I can check the latest version on Windows, but before it's better to merge my pull request which is fixing current issues with tests in the project.