ENHANCEMENT: Add use gravatar flag, but default to false to maintain current non gravatar functionality
ENHANCEMENT: Added gravatar method to get the URL for the gravatar from the email address submitted with the comment
ENHANCEMENT: Show gravatar if it is enabled in the commenting configuration
ENHANCEMENT: Added gravatar configuration
ENHANCEMENT: Enabled change of gravatar icon size via configuration
ENHANCEMENT: Added gravatar size to the configuration options
Merge pull request #52 from gordonbanderson/ISSUE8

Addition of Gravatars