Clarify WEBM_AUDIO_SPOILER usage
Document SPOILER_IMAGES
♫ in front
Provide image filesize for model extraction
Expand the responsibilities of get_thumb_specs
get_thumb_specs() takes image object
PNG thumbnail transparency

Optional PNG thumbnails with transparency for PNG images
Don't generate PNG thumbnails for WebMs
Merge branch 'samurai'

* samurai:
  Don't generate PNG thumbnails for WebMs
  PNG thumbnail transparency
  get_thumb_specs() takes image object
  Expand the responsibilities of get_thumb_specs
  Provide image filesize for model extraction
  ♫ in front
  Document SPOILER_IMAGES
  Clarify WEBM_AUDIO_SPOILER usage

Conflicts:
	common.js
	imager/config.js.example
	imager/daemon.js