Emccd model

[syhaffert]

I added functions to simulate the noise from the electron-multiplying gain process. This is a more accurate way to simulate the noise from EMCCD cameras. I followed the procedure from https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0053671

Hirsch, Michael, et al. "A stochastic model for electron multiplication charge-coupled devices–from theory to practice." PloS one 8.1 (2013): e53671.

[codecov[bot]]

Codecov Report

Merging #163 (8e08409) into master (38b6e89) will decrease coverage by 0.25%. The diff coverage is 57.33%.

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
- Coverage   80.99%   80.73%   -0.26%     
==========================================
  Files          95       95              
  Lines        6986     7060      +74     
==========================================
+ Hits         5658     5700      +42     
- Misses       1328     1360      +32     

Impacted Files	Coverage Δ
hcipy/aperture/__init__.py	100.00% <ø> (ø)
hcipy/util/__init__.py	100.00% <ø> (ø)
hcipy/aperture/realistic.py	91.11% <47.45%> (-4.61%)	:arrow_down:
hcipy/util/stats.py	96.29% <93.75%> (-3.71%)	:arrow_down:

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