Remove grunt githook and replace with package.json's postinstall script

[mlasak]

The hook is installed using a node script

Pulling this functionality out of #3253
As discussed in #3596

[mlasak]

@dsilhavy wdyt?

[bbert]

@mlasak have you tested on Windows? It seems there is an issue on Windows with the folder path

[mlasak]

sorry that you seeing an issue here. But yes, we have tested on Mac and Win, even did some changes to make it work on Win. Could you post the problem you see?
@dsilhavy fyi

[dsilhavy]

@bbert I saw an issue with folders on Windows first as well. Basically an error was triggered when the pre-commit folder already existed. @mlasak made some changes and it solved the problem. Did you check with the latest changes in this branch?

[bbert]

I tested once PR has been merged.
There is only one commit in this branch, isn't it?

[mlasak]

Yes, only one single commit and exactly this one that was merged. If you post the error message we could maybe better understand what's going wrong.

[bbert]

{ Error: spawn C:\Windows\system32\cmd.exe ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:240:19)
    at onErrorNT (internal/child_process.js:415:16)
    at process._tickCallback (internal/process/next_tick.js:63:19)
    at Function.Module.runMain (internal/modules/cjs/loader.js:832:11)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
  errno: 'ENOENT',
  code: 'ENOENT',
  syscall: 'spawn C:\\Windows\\system32\\cmd.exe',
  path: 'C:\\Windows\\system32\\cmd.exe',
  spawnargs: [ '/d', '/s', '/c', '"npm run lint"' ],
  cmd: 'npm run lint' }