Changes to get the package working with Telescope
- Use modified version of jparker:gravatar in order to support
  pre-generated email hashes
- Export Avatar object and add 'options' property
  - If Avatar.options.emailHashProperty defined, this property on
    the user object will be used for retrieving gravatars (useful
    when user emails are not published)
Version bump to 0.1.0
- also specify jparker:crypto-md5 version in package.js
- versions.json updated during publish