Implement ObservableNestedScrollView#257

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Nebu1eto wants to merge 5 commits intoksoichiro:masterfrom

Nebu1eto:master

Commits on Jul 19, 2016

Update Gradle Plugin to Latest Version
Haze Lee
committed
Implement Observable NestedScrollView
Haze Lee
committed
Add Some Test code from ScrollView
Haze Lee
committed

Commits on Jul 25, 2016

Fix Exception when Saving its State.
Haze Lee
committed
Fix Extends to NestedScrollView
Haze Lee
committed