DAM documentation

Refactor http://doc.nuxeo.com/x/UAA7 with the following plan:

1. Overview
   Nuxeo DAM brings that feature and that feature and balblabla

1. Picture Management
   1. Architecture
      a diagram for conversions , introduce involved extension points as well as specific necessary facets
   2. How tos
      1. configure a new picture type
      2. change resolution/conversions

1. Video Mangement
   1. Architecture
      a diagram for conversions, story-boarding, introduce involved extension points as weel as specific necessary facets
   2. How tos
      1. configure a new video type
         1. change resolution , storyboarding logic

1. Sound ?

1. Metadata Extraction
   1. Architecture of IPTC/EXIF extraction
   2. Customisation ? (at least link to Lauren't blog post if nothing is configurable with current state of the platform)

1. Picture Annotation and tiling
   1. Architecture

1. Reference Nuxeo-Labs "image crop module"