Add Memory and Content Visibility concept

[mediafinger]

Making Memories

• Add Memory model - the first content type - which contains
  • a memo text between 4 and 500 characters
  • optionally: a picture insight
  • optionally: a location insight
  • optionally: a weblink insight
• Add content visibility concept
  • every memory starts as draft
  • team members of certain roles can advance them to internal
  • the publisher can advance them to published
  • team members of certain roles can advance them to archived
  • the visibility status blocked will be used by content moderators