Should check for curl

[JohnMcLear]

No description provided.

[tomnomnom]

If you want people to use the class you should make it run on as many platforms as possible. I've seen some shared hosts etc around that don't have curl installed. My fork falls back to file_get_contents, but even that won't always work, but it is better than nothing.

[jwalck]

When I'm done with matching the API spec, I'll look into removing the cURL requirement. Probably making it optionalas TomNomNom suggested rather than removing cURL alltogether (I like cURL:).

[damac23]

Please do not remove cURL.
Fallbacks are good enough :)