Update print statements to function syntax, add from __future__ import print_function in test.py, change shebangs to /usr/bin/env python, replace str.translate with re.sub for anchor sanitization in generate_docs.py, and decode subprocess output to utf-8 in test.py for cross-version string handling.
- Create AUTHORS file listing Robert Nystrom as initial contributor
- Rewrite README to emphasize Wren as concurrent scripting language with fiber examples
- Expand contributing.markdown with structured sections for finding tasks and making changes
- Update index.markdown with call-to-action links for trying and contributing
