Updated ethercard library
PWM Frequency

This is probably not a very good idea since it affects the timers.  I
will see how this goes and probably switch back to the RC filter
solution.
Update target SDK to Lollipop final

No more L preview!
Remove MDPI resources.

The amount of MDPI devices on the market is pretty low and generally the
low resolution screens look like crap anyway. The downscaled graphics
will work just fine here.

New material-ish icon
New material-ish icon

A better fit with all the new fancy material-design icons.
Clean up
Gradle/AS updates
Refactoring