Fix Paramtest for glmnet, add predict.gamma and newoffset arg

[pat-s]

fixes #93

New parameters for glmnet:

• predict.gamma (gamma at predict-time)
• newoffset

Paramtest now uses predict.glmnet() instead of the non-existent predict.cv.glmnet().

[codecov-io]

Codecov Report

Merging #98 into master will decrease coverage by 0.36%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
- Coverage   97.47%   97.11%   -0.37%     
==========================================
  Files          19       19              
  Lines        1031     1041      +10     
==========================================
+ Hits         1005     1011       +6     
- Misses         26       30       +4     

Impacted Files	Coverage Δ
R/LearnerClassifGlmnet.R	95.60% <66.66%> (-2.08%)	⬇️
R/LearnerRegrGlmnet.R	95.00% <66.66%> (-2.34%)	⬇️

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