Fix a request window feature behavior. Close #720
setContentView(null) NPE fixed

Fixed NPE when calling setContentView(null)
Merge pull request #721 from kkocel/patch-1

setContentView(null) NPE fixed
Revert "Merge pull request #721 from kkocel/patch-1"

This reverts commit 7aac016b4680dc48f18edc769efcfa7e4715ceca, reversing
changes made to e3901310211b3701de89df699d59c15111a2f6ac.
Basic migration on API 19 (support-v4 and build-tools only, appcompat will update later)
More powerful support of toast (close #719)
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[deploy snapshot]