Output valid Scheme when printing the AtomTable contents
Add PLN documentation
Update PLN documentation
Remove verbose debug output by default in PLN rules and chainers
Add PLN example: simplest forward inference agent with deduction
Add tutorial to PLN documentation
Update documentation formatting
Update documentation formatting
Merge pull request #503 from cosmoharrigan/pln

Add basic PLN documentation, tutorial, and example of forward chaining agent
Small update to PLN tutorial
Merge pull request #504 from cosmoharrigan/pln

Small update to PLN tutorial
Update PLN tutorial
Fix cosmo's merge conflicts