Avatar Setting

Valine is used in Gravatar (with gravatar.cat.net mirror service) as commentator avatar.
Has seven optional values:

value	style	memo
Empty string:''		Gravatar official graphics
mp		Mystic man (a grayhead)
identicon		Abstract geometry
monsterid		little monster
wavatar		A combination of different faces and backgrounds
robohash		a generated robot with different colors, faces, etc
retro		Eight-pixel retro portrait
hide		Hidden avatar

The parameter value hide is supported at v1.1.8-beta.
If the value of avatar is not equal to one of the seven parameters, the default value ismm.

new Valine({
    ...
    avatar:'' // (''/mp/identicon/monsterid/wavatar/robohash/retro/hide)
});