Merge pull request #137 from atlasapi/image-attributes

Add Image.Builder class
Merge pull request #138 from atlasapi/image-attributes

Add Image.builder(Image) to create Builder from prototypical Image
add upcoming and available content fields to Person
fix Playlist recent content field XML naming
Merge branch 'people-upcoming' into stage

* people-upcoming:
  fix Playlist recent content field XML naming
  add upcoming and available content fields to Person