Issue #7: Disabling the hooks in the list git-hooks.json

By removing the list of all hooks, this will disable the installation
of all hooks altogher.

*	modified:   lib/git-hooks.json
- Removing all the hooks to be placed/groupd into modules.
Issue #7: Modular architecture implementation.

This commit implements the initial version of a modularized version of
git-guppy. Instead of using a static list of hooks to be installed, this
version will use hook collector library to retrieve all the installed
git-guppy-HOOK_MODULE that's installed by the user. That is:

1. Users will have this version installed first, and it will be empty.
- No hooks are installed by default.

2. Users will have to install each hook group individually.
- They will be installed and trigger the installation again.

3. If users install any of the hooks before, the user will be warned
- Since there's no way to install the hook, we just tell the user to do that.

*	new file:   lib/hook-collector.js
- Collects the installed hooks from the user by verifying the installed
  packages in the package.json.

*	modified:   scripts/install.js
- Uses the collected scripts to install.

*	deleted:    lib/git-hooks.json
- The hooks are computed by the hook-collector.js module.