HowSteep(坡度仪) for android v3.0 安卓版

HowSteep是安卓手机基本上都带有硬件传感器，只要你手机硬件没问题，坡度的显示应该是非常准确的
【更新说明】
Brought up to date with Android design patterns - added a proper action bar.
Updated resolution of the background images - this does make the app bigger but modern large screen phones need it.