Composer

I noticed there are several packages available on Packagist (see https://packagist.org/search/?q=errbit)

I think you should add support for composer yourself. 
I used filppa-official, because flippa/errbit-php has already been used.

As soon as you publish your package on packagist people will only need to add the line below into their composer.json-file. 

    "flippa-official/errbit-php": "dev-master"


For now they will need to add the repo also.