Use python26 on CentOS for node build
Use separate install-deps instructions for Red Hat 5 vs. 6
Add manual.test/loadtest.js

This script is much lighter weight than phantomjs because it doesn't
actually execute any javascript; it just makes HTTP and WebSocket
requests in the same way a real client would during startup.

Therefore this script can saturate a shiny-server instance using a
single client machine/VM.

There does seem to be a limit on how many sessions can be launched
at once before a single loadtest.js instance fails; on my dev machine
with ulimit -n 2000 it is about 260-270.
Upgrade to Node v0.10.17
Go back to using TCP sockets for communication

The new loadtest.js script indicates that for whatever reason, using
TCP connectivity to R worker processes is far more stable than
Unix domain sockets. This commit switches us back to TCP but also
abstracts out a transport layer that makes it trivially easy to
switch back and forth between the two, or add new transport types.
Remove socket dir from scripts and docs
Autodetect debian vs. redhat in make-package.sh
Merge pull request #44 from jcheng5/tcp-transport

Go back to using TCP sockets for communication