Improved automation and methods.

Summary method extended with comparison statistics
Extended methods for auto-extracting model metadata (lhs, response)
Added comparison plot for factor responses
Documentation extended with new examples
Ability to specify glm options
Added more informative progress messages

Core functionality with documentation

Specify parameters hierarchy
Use of S3
Add DALEX integration
More variations on building xspliner
More examples
Add plot and summary method
Complete package documentation
Export only main package functions, non-exported ones moved to utils
Basic functionality for xspline.formula method