Switch to vanilla upload.php

With just some minor tweaks, we no longer need blackniggers/kittens.php!
Merge branch utf-8 into patch-1

Conflicts:
	gyazowin/gyazowin.cpp
Change ?output in URL

Since the server provides a ?output=gyazo endpoint now
Merge pull request #2 from NuckChorris/unified-upload-page

Switch to upload.php