Button selector inset and change corner radius to 2dp
Two separate selectors: button and normal;
Normal selector for lists and stacked buttons
Button selector for side-by-side buttons
Padding in selected item drawable replaces padding in styles
Fix stacking algorithm;
also tweak button min-width and button frame margins for insets
Update build.gradle
Merge pull request #91 from plusCubed/master

Fix button insets and stacking algorithm