Added stats and summary functions for trace
calc_interval now throws ValueError when there are insufficient elements.
Bugfixes to stats calculation
Created utilities.py to keep utility functions
Added autocorrelation and autocovariance functions to utilities.
Refactored summary to eliminate stats call
fixed metropolis related issues: stalling from having lambdas during parallel sampling and non convergence in tests
added better error when no default is found
exercise default values for distributions
fix argument errors
give suggestions with optimization error message
removed slice test since it's failing due to an error; can you mark a known failure in a generated test?
travis change
separate examples / other tests
fix?
removing unnecessary dependencies
guess just python-scipy doesn't work; does just pip install scipy?
readd swig
add back scipy dependencies
Added stats and summary functions for trace