Don't use null pen when drawing the SVG canvas

Remove unneeded variable in wxBitmapBundleImplLunaSVG::DoRasterize()

Maintain aspect ratio when rendering with LunaSVG

Clean up code

Update README.md

Credit LunaSVG with code used in conversion

Improve usage of wxMemoryBuffer in CreateWithLunaSVGFromFile()

Add compile-time option to include bundle creation in benchmark time

Initial commit