Flatten optimization
Functional style is a bit faster here
Started contributing document
Rearrange doc structure and added DEPRECATED & LICENSE files
Renamed README file ext
Transcoded LICENSE to markdown
Fixed bullet list in LICENSE
Deprecated legacy Singleton methods, and grouped old test cases intp an exclude group.

 - Polyline::listPolylines
 - Polyline::polyline
 - Polyline::getPolyline
 - Polyline::__call
 - Polyline::Singleton
 - Polyline::__construct (removed)
Minor :lipstick: changes in README
Fixed language spelling in precision example