Add --agent switch for easier profiling
Include easy-to-launch config and app for test purposes

tools/test-config.sh
Fix bugs in loadtest.js
Add loadtest-xhr load testing tool
Better memlog-view script--now uses Shiny
Catch unhandled exceptions in loadtest-xhr
Updated node-devtools-agent.
Delay SIGUSR2 signal on --agent.
Merge branch 'master' of github.com:rstudio/shiny-server