detectRetina has to be false

Because we (Lyrk) are already providing 512x512 tiles, no further scaling (detectRetina) is needed otherwise the fonts on mobile devices are really tiny.
Merge pull request #19 from denkmap/detect-retina

detectRetina has to be false
Production build for retina fix
Merge pull request #20 from denkmap/develop

Mini release for retina fix