Merge pull request #46 from DIdiHL/mia

fixed a bug
Added tests for bluetooth Device
Merge pull request #47 from DIdiHL/zhaoyue

Added tests for bluetooth Device
implemented ContentProvider and logic of transfer binary data
Merge pull request #48 from DIdiHL/chenxi

implemented ContentProvider and logic of transfer binary data
Modify documentation.
Merge branch 'development' of https://github.com/DIdiHL/plugin_android_library into hanlin
implemented file explorer in mocksana
Merge pull request #49 from DIdiHL/chenxi

implemented file explorer in mocksana
Add unit test for DeviceFactory.
Merge branch 'development' of https://github.com/DIdiHL/plugin_android_library into hanlin
Merge pull request #50 from DIdiHL/hanlin

Add test for DeviceFactory
some tests for audio recording