Use fightbulc/php_curl instead of native curl functions.
Remove getRequestOptions()
Getters and setters for cookie_file, user_agent and follow_redirects.
Getter and setter for referer.
Getter and setter for custom headers.
Getter and setter for custom options.
Change php_curl from branch master to version 1.0.*
Merge pull request #2 from komex/develop

Uses curl wrapper, getters and setters for properties