clear up licensing issues

[stevesea]

see here: https://plus.google.com/+CourtneyCampbell/posts/Lrj3v2uzwJ7

action items:

• remove mythic fate chart variant (no license mention on blog. or track down author of blog post)
• remove 4th page (or find contact info for Mike Riverso... this was released under CC)
• clarify OGL implications. http://www.wizards.com/default.asp?x=d20/oglfaq/20040123i
  • explicitly put very high up in github page/app which content is OGL and which is not.
  • provide links to the OGL content where people can see it as text
  • (do other necessary stuff for OGL-in-software... need to investigate)
• figure out a way to make copyright/attribution more visible on each set of generators. button in nav? button in action bar? button near generator buttons?
• ensure content attribution document is easier to generate and clean up layout in attribution .md document