support for checking if values are set, getting a string description of states/objects/values where uset values are set to null, and added a console to the VisualExplorer that lets objects to added, removed, and modified.
modified JSON state parser to be a more robust to how data in the JSON object is represented. For example, stored string representations will be accepted for attributes that are real valued in BURLAP.
added a standard random policy object (defined in the Policy.java file) for single agent domains. It can be seeded with the primitive actions from a domain or alternatively have additional actions (e.g., options) added to it.
updated java doc
Merge pull request #39 from jmacglashan/jmacglashan

Jmacglashan