Add option to reset battery stats (1/2)

Thanks to CyanogenMod and @jruesga

Conflicts:
	core/java/android/content/Context.java
	core/res/res/values/mahdi_strings.xml

Conflicts:
	core/java/android/content/Context.java
	core/res/res/values/ras_strings.xml

Change-Id: Ia515cef60fd1d9ff60a4933733cd1859764aaecc