Seterror for unsupported properties. On Android, getProperties to explicitly convert non string property values to string
Merge branch 'master' into gxv738_dev
Remove the setError for unsupported sensors in both Android and Windows Mobile. Remove setError for autorotate property in Screen Orientation for  Windows Mobile
Merge pull request #174 from GXV738/gxv738_dev

Sensor and ScreenOrientation