final changes for cran submission version 0.3.1

Update CRAN comments

Merge pull request #7 from bips-hb/CRAN_html_fix

innsight 0.1.1: Bugfix with HTML5

Add NEWS.md

This is the version before we turned to torch. It contains the method…

…s 'DeepLift', 'LRP', 'Connection_Weights', 'SmoothGrad', and normal gradients but only for fully connected dense-layers. The internal calculations are made in base R via simple matrix multiplications, which means that there are no big dependencies. It is still noted that this was the first attempt and it will not be developed further (for now).