Update precommit-hook version.

__Problem__: running `npm install` on first clone results in a versioning error.

__Solution__:
This PR updates `precommit-hook` in `package.json` to the most recent version available on NPM, [1.0.7](https://www.npmjs.org/package/precommit-hook).

__Additional Note__:
* This PR also removes unnecessary `npm-debug.log` to avoid potential confusion to future cloners/forkers.