Add the Gyazo.com

Now a lot of user use the Gyazo.com for send images to friends.

Info API: https://gyazo.com/api/docs/image

Test on my fourm of Vanilla 2.1.5.
http://www.megaplanet.net/mc/foro/

It work with no error.
Merge pull request #5 from XxCoolGamesxX/master

Add the Gyazo.com