[V] Gist 0.2.0 - Create new gist & delete existing gist

[+] Method put() - Initial - Create new gist
[+] Method url() - Initial - Retrieve URL of the gist
[+] Method delete() - Initial - delete existing gist
[+] Internal Method __extractIDFromURL() - Initial - Extract gistID from given URL
[+] Method __HTTPpost() - Initial - post-Request
[+] Method __HTTPdelete() - Initial - delete-Request
[-] Method new() - Removed ID as parameter from constuctor
[*] Methods get() & getJSON() - Introducing ID as parameter
[*] Renamed internal method __get_json_obj() to __HTTPget_obj()
[*] Renamed internal method __get_json() to __HTTPget()
[*] Method __HTTPget() - considering authorization
[*] Enhanced example