Added cnbinom to init
Added beginning of cnbinom to distributions
Changed k to k_agg to avoid conflict with native scipy variable
Generalized brute force solver for cnbinom
Added cnbinom to init
Updated docstring and stats method of cnbinom
Added visual test of cnbinom distribution
Add 1d check to geom_uptrunc cdf
First draft of _curves
Soft wrap long methods and attributes in docstrings to avoid numpydoc error
Merge branch 'add_cnbd' into develop

Conflicts:
	macroeco/models/__init__.py