Git hooks made easy

This is a fork of husky with a few changes:

• Prioritizes package.json located next to .git directory, instead of hard-coded upward search. This avoids the problem when a root package in a lerna monorepo and a sub package both depends on husky, it gets confused and double-updates the root git hooks with wrong paths.

• Changed where hooks are read from in package.json:

  Before

  {
    "scripts": {
      "precommit": "foo"
    }
  }

  After

  {
    "gitHooks": {
      "pre-commit": "foo"
    }
  }