adds switcher buttons
adds layer switcher
clears overlay on addLayer
moves the viewport by .1 to show new layer instantly
adds new jar buil;d with layer switching
addsd savedPosition
removes switchTo
adds public demo apk
changes test metadata
fixes viewport displacement on layer switch
adds basic Mapbox styling
Merge pull request #31 from mapbox/demoapp

Continuing development using demoapp instead of osmdroidtests