adds switcher buttons
adds layer switcher
clears overlay on addLayer
Merge pull request #28 from bleege/master

Removing Machine Specific Config Files
moves the viewport by .1 to show new layer instantly
adds new jar buil;d with layer switching
addsd savedPosition
removes switchTo
updated JAR link
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
changes addLayer to switchToLayer
removes Tooltip file in test
adds quickstart guide
adds links to quickstart
improves overlay explanation in quickstart
adds title to quickstart