Remove all @Ignored tests.
DANGER: Replace @RealObject ContxtImpl with RuntimeEnvironment.application.

This should essentially be the same thing. But it's not. We have no idea why it works.

Reevaluate this before merging back onto master.
Realism upgrade for Preferences.

Delete preference shadows that were shadowing code that works in Robolectric.
Parse interpolator resources.
Exclude certain WindowTests on API 21.
Delete more @Ignored tests.