Added David's Revision
Merge branch 'master' of https://github.com/mattmaynes/CCDP-2100-D

# By CJMatx (4) and others
# Via CJMatx
* 'master' of https://github.com/mattmaynes/CCDP-2100-D:
  Update Introduction.md
  Added my edit of contract to the timeline
  Update References.md
  Update Background.md
  Update Introduction.md
  Update Introduction.md
  Update Introduction.md
  Update Background.md
  Update References.md