Import into AndroidStudio; convert to Gradle
Update build tools to 21.0.3 (from 19.1.0)
Post-gradle .gitignore additions

Based on http://stackoverflow.com/a/17803964/846252
Improve the scaling; use densityDpi values, not constants

THe Nexus 6 falls through a gap, illustrating that this wasn't a sensible way
forward.