C2FO/nools — pull request #91 by doug-martin (2013-11-20 23:31:06+00:00)
Title: v0.2.2

* Performance Upgrades
* Added BetaNode indexing
* Abstracted out JoinNode to extend BetaNode (Prevents the checking of constraints if there are not any constraints to check)
* Refactored BetaNetwork
* Created a new Memory Class to encapusulate left and right memory for BetaNodes
* Added new `exists` logic operator to check for existence of fact (opposite of `not`)