Openlayers classes use an underscore suffix convention to mark class
members as private. These are undocumented implementation details and
presumably unsafe for code outside the class to rely on.
Allowing javascript minimisation to change these names gives 5% bundle
size reduction to the library.
Copy LICENSE.md as well as README.md to build when preparing package.
These files are useful for tools that inspect node_modules for
dependency details.
Martin Packman