Returns URL or img DOM element for a given email,
uses options as query parameters with URL.
More about query parameters read at Gravatar
website.
Returns URL which points to Gravatar for a given email
and using options as query parameters with URL
getGravatarUrl "[email protected]" "?s=200"
-- returns url to 200px x 200px image
-- for "[email protected]" email.
Returns img DOM element which points to Gravatar for a given
emailand using options as query parameters with URL