Unified alternative update and hinge derivative.

1. Hinge calculation has been simplified to use arma methods
2. Hinge derivative now does not have precision parameter and this is true estimation of the gradient of the calculated function. The calculation also has been simplified both for proportions and basis using arma functions and conceptual similarity between W and H.
3. added squared hinge loss errors and derivatives (which did not give good results so far)
4. alternative optimization significantly reworked. Now we perform single calculation of the derivative only with respect to X, directly calculating gradient of the function term involving inverse.
5. This version is a new minor version of the package, since this changes are not included into the paper

What's Changed

• Modification for optimization procedures by @denklewer in #65
  Full Changelog: v1.0...v1.1