v0.2.3

* Added new `getFacts` method to allow for querying of facts currently in session. #52;
* Added indexing on comparison operators (i.e. `>, <, >=, <=`).
* Updated documentation.
   * Added new section about retrieving facts from a session.
   * Created new section for async actions to address #94
Merge pull request #95 from doug-martin/index-work

v0.2.3