This is just enough info to get you up and running.
This master branch contains the latest code, which is still fairly unstable and flakey. It does work, but I can''t promise much more.
First, you need MongoDB running locally, then run
git clone http://github.com/ewanleith/Personal-Twitter-Archive.git
cd Personal-Twitter-Archive
Edit the app.js file to contain your username then run
node app.js &
However, note that github tarballs do not contain submodules, so those won't work. You'll have to also fetch the appropriate submodules.
Once everything starts cleanly
Point your web browser to the server running app.js on port 3000, e.g. http://127.0.0.1:3000
The code also works correctly on CloudFoundry, just bind a MongoDB service to your app and it will automatically detect the MongoDB username and URL to use