Make use of Composer/ca-bundle for easier SSL support

[madman-81]

I would like to propose to make use of Composer's ca-bundle package (https://github.com/composer/ca-bundle). Integrating this packages could make it a lot easier to support SSL/HTTPS. Just like @tbar0970 and @bgaillard in #200 I wasted an hour to figure out why my API call wasn't working and, just like them, it turned out I hadn't configured curl properly.

Since I am not the first, and probably not the last, integrating this package sounds useful to me.