Follow the following to get asciiflow running locally.

Clone closure-library at the same level as asciiflow2:

$git clone https://code.google.com/p/closure-library/

Update compile.sh script if neccessary and run it:
$./compile.sh

This may require chmod a+x on some files.

Run a simple web server:
$python -m SimpleHttpServer

Goto localhost:8000/root.html