2018.05-05
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Refactored code: 

1. ARFPOP is now estimate_spikes. Returned list is slightly refactored!
2. New utility functions for plotting, printing fits, and simulating according to 
and AR(1) model. 
3. New function estimate_calcium to estimate the calcium concentration after estimate_spikes is run. 

2018.05-03
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Major updates to the package:

1. Updated constrained and unconstrained models for better numerical stability over long periods of no neural activity 

2. Require LZeroSpikeInference as dependency 

3. Remove cross validation utility

2018.03-02
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Updated to avoid numerical instabilities 


