Endless loop on windows and FindUp.sync

[mgreter]

Related to: #4 and #5
Got that bug while working with gulp-rtlcss and tracked it down:
https://github.com/Filirom1/findup/blob/master/index.js#L96
Demo repo: https://github.com/mgreter/bug-gulp-rtl-with-cwd

[mgreter]

Boils down to the following:

var root = 'directory';
console.log('root 0: ', root);
root = Path.join(root, '..');
console.log('root 1: ', root);
root = Path.join(root, '..');
console.log('root 2: ', root);
root = Path.join(root, '..');
console.log('root 3: ', root);

Gives:

root 0:  directory
root 1:  .
root 2:  ..
root 3:  ..\..

Version:

$ node -v
v4.5.0