Poisson bug

[dswah]

• [x] PoissonGAM checks shape of exposure, weight and observation arrays before fitting
• [x] rounding and casting observations to int before computing Poisson pmf fixes -inf in model summary (https://github.com/dswah/pyGAM/issues/173)

[codecov[bot]]

Codecov Report

Merging #179 into master will increase coverage by 0.03%. The diff coverage is 94.59%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   91.54%   91.58%   +0.03%     
==========================================
  Files          19       19              
  Lines        2341     2364      +23     
==========================================
+ Hits         2143     2165      +22     
- Misses        198      199       +1

Impacted Files	Coverage Δ
pygam/distributions.py	88.32% <ø> (ø)	:arrow_up:
pygam/tests/test_GAM_methods.py	100% <100%> (ø)	:arrow_up:
pygam/utils.py	78.47% <100%> (ø)	:arrow_up:
pygam/pygam.py	89.45% <88.88%> (-0.01%)	:arrow_down:

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