showcase mode stub controlled by showcase=1 parameter
show ui.R and server.R files in showcase mode
use built-in parseQueryString
highlight code with highlight.js
send reactive log information to the client
scaffolding for flashing executing outputs
refine source ref location (columns still need work)
find column by sibling nodes
initial support for code pop-out
improve style and behavior of code popout window
initial support for header generated from DESCRIPTION
initial support for Readme.md
refactor showcase outputs from renderPage
add showdown dependency
initial support for sending source refs for reactives (not wired)
fix highlighting for text points inside <SPAN>s
clarify regions of app UI vs. showcase UI
fix some animation and margin problems
fix node cloning on IE browsers
move showcase js to its own file; fix cross-document bug on firefox