Configure composer package

[erik-ropez]

Adding ability to install via composer.

In order to install:

Add repository into composer.json:

"repositories": [
        {
            "type": "vcs",
            "url": "git@github.com:erik-ropez/boletofacil-php.git"
        }
    ]

And run: composer require boletofacil/boletofacil-php:dev-master

Then use use BoletoFacil\BoletoFacil; in your code.