Added some new error uris

Hi all!

This PR adds alt text to pictures, and extends a predefined error URIs.
Well, in ideal that errors should not appear on router, cause that cases should be checked on client side before sending messages to WAMP router, but, what if some implementation doesn't do that check? 
And also this will be good for consistent error list on both sides (client and server).
One drawback is wamp.error.no_suitable_callee. Cause that error belong to advanced profile, but there is no error list in A.P. so i've added that here