v0.4.2

Merge pull request #147 from doug-martin/master

v0.4.1

Merge pull request #144 from doug-martin/master

v0.4.0

Merge pull request #114 from doug-martin/master

v0.3.0

Merge pull request #95 from doug-martin/index-work

v0.2.3

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`)

Merge pull request #90 from doug-martin/master

v0.2.1

Merge pull request #80 from doug-martin/master

v0.1.14