Modify documentation.
Merge branch 'development' of https://github.com/DIdiHL/plugin_android_library into hanlin
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
grant read permission