Use parse-torrent by feross

There's no point on implementing multiple versions of a torrent parser.
Let's use feross' and maintain only one.

Commit changes:

- Parse with `parse-torrent`
- Ensure a true asynchronous callback with `process.nextTick`
- Updated README.
- Added error checking in cli.js
Support magnet uri

Read torrent will also support reading information from magnet uri.

Also, when https://github.com/feross/magnet-uri/pull/2 gets merged and
published the resulting information will be more. (Might need to update
package.json dependency version)
Update magnet-uri dependency

It's been published
Merge pull request #4 from ivantodorovich/magnetsuri

Magnetsuri