Add logging to __init__
Begin updating bq.py with new derivation
Misc changes; add some plotting code
Add an example ipython notebook
Add MANIFEST.in
Update docs
Choose better candidates
Rename R --> x and S --> l
Remove gamma
Clean up bq.py a bit, update some docstrings
Update Z_mean
Update Z_var
Add docstrings for Z_mean and Z_var
Variance should be sigma^2, not sigma
Update derivation notebooks for mean and variance
Update references
Update tests a bit
Update derivation for expected variance
Initial implementation of expected_Z_var
Add approximation functions