modify order of param validation in gridsearch

[dswah]

We need to validate the data-dependent model parameters after validating the data!

this fixes #245 and fixes #246 and fixes #232

[codecov]

Codecov Report

Merging #251 into master will increase coverage by 0.14%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #251      +/-   ##
=========================================
+ Coverage   95.05%   95.2%   +0.14%     
=========================================
  Files          22      22              
  Lines        3178    3192      +14     
=========================================
+ Hits         3021    3039      +18     
+ Misses        157     153       -4

Impacted Files	Coverage Δ
pygam/pygam.py	94.8% <100%> (ø)	⬆️
pygam/tests/test_gridsearch.py	100% <100%> (ø)	⬆️
pygam/utils.py	87.73% <0%> (+0.3%)	⬆️
pygam/tests/test_GAM_methods.py	100% <0%> (+0.36%)	⬆️
pygam/tests/test_utils.py	96.5% <0%> (+1.39%)	⬆️

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