Merge pull request #34 from DIdiHL/zhaoyue

Fixed a bug which results app not working
Fix polling event bug.
Merge branch 'development' of https://github.com/DIdiHL/plugin_android_library into hanlin
Merge pull request #35 from DIdiHL/hanlin

Hanlin
Fix unit test for event.
Merge branch 'development' of https://github.com/DIdiHL/plugin_android_library into hanlin
Add listener tests. Pass all tests.
Rename the test case.
Merge pull request #36 from DIdiHL/hanlin

Hanlin
add accelerometer in MockApp
Merge pull request #37 from DIdiHL/chenxi

add accelerometer in MockApp
add test content provider in MockSana
Merge pull request #38 from DIdiHL/chenxi

add test content provider in MockSana
Added switchToBluetooth to library