Prepare for Release 1.8.7

Change-Id: I58b28fab5f98e01768003ce5eeff43a44f7e0b4c

Prepare for Release 1.8.1

Change-Id: I7781229d22fd5abbe0b6060bdeaae26747f2b621

Github Release 1.7.2

Github Release 1.7.1

GitHub Release 1.6.4

Prepare for 1.6.0 release

Change-Id: Ied7fe37d7752e923a526f370e4751a22d09ec296

Add SmartGadget-Android source code