Add cookbook recipe for persistence. Fixes #2946.
Merge branch 'development' into branch/persistence-doc
Add persistence.md to Rakefile.
Fix "Troubleshooting" typo in Testing section.
Add information on how to programmatically save and load states.
Merge branch 'development' into branch/persistence-doc
Merge pull request #88 from virtual-world-framework/branch/persistence-doc

Add Persistence Documentation. Fixes #2946.