Representing battery health as a string
As defined in: http://developer.android.com/reference/android/os/BatteryManager.html
Property Health is changed from type int to type string to give a string representation
of the value obtained from dumpsys regarding battery health.
Submitted By: Omar Bizreh [omarbizrehxda@gmail.com] [DeepUnknown from Xda-Developers.com]