Bump dcos-docs
Bump dcos-docs

Bump dcos/dcos-docs
  Karl Isenberg:
     Add script to generate marahton swagger yaml
     Update Marathon Swagger for 1.9
     Capitalize Package Management API
     Update API routes
     API ref text tweaks
     Add versioning, authentication, and route usage API sections
     Add top level API Reference section
  joel-hamill:
     Formatting fix
     Screenshots
     More graphics
     WIP
     Missing screenshots
     Graphic resize
     Added improved CLI graphic
     Added improved IOT graphics
     Added CLI install screenshot
     Added CLI screens
     Tutorial screenshots
  Branden Rolston:
     Update 1.9 Docker install guide for CentOS with Docker 1.13

dcos/dcos-website,dcos/dcos-website,dcos/dcos-website,dcos/dcos-website