Markdown readme file.
Moved everything in a lib/ directory.
Added composer file.
Updated readme.
Cosmetics.
Got rid of all the require statements, because we're now using the
composer autoloader.
Updated changelog
Updated changelog.
dev dependencies.
ignoring composer files
Added support for HTTP headers in cURL client
Merge pull request #5 from m4tthumphrey/http-headers

Added support for HTTP headers in cURL client
Updated contributors