Ensure animation happens between 0 and supplied alpha.
Remove cap on memory cache. Fix up comment to be more accurate.
Update to Robolectric 2.2 and un-ignore previously failing test.
Merge pull request #282 from square/jw/alpha

Ensure animation happens between 0 and supplied alpha.
Merge pull request #283 from square/jw/no-cap

Remove cap on memory cache. Fix up comment to be more accurate.
Merge pull request #284 from square/jw/robo

Update to Robolectric 2.2 and un-ignore previously failing test.