Import the rappor-analysis and rappor-sim web apps.  See apps/README.md.

Initial import of shiny apps

Shell scripts to run the apps

First pass at README

Update dir structure doc.  Tweaks apps/README.

Latest version of apps.

Add instructions on run_app.sh

Doc tweaks
Merge branch 'feature/shiny-apps' of github.com:google/rappor into feature/shiny-apps