GATT notifications : use setCharacteristicNotification from Android 4.3#307

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fmhun wants to merge 2 commits intoranddusing:masterfrom

Commits on Jul 11, 2016

Fix issue #294 - call setCharacteristicNotification when subscribe to notification from Android 4.3.
fmhun
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Commits on Jul 12, 2016

Handle setCharacteristicNotification error, remove sdk target check.
fmhun
committed