Merge "Updates and refactors notification wear sample to work on sdk 26 and...

Merge "Updates and refactors notification wear sample to work on sdk 26 and use the latest support library widgets. I also refactored some code that was used in multiple places into a Shared module." into oc-dev am: b7bc75f3 am: 6be4efc7 am: 81817560
am: 72629b26

Change-Id: Ia276447aecbbcca152c45fe3e7ca9a42b4e223d8