require that --daemon is uid/gid 0
execv invocation fixes

Change-Id: I80e7100a834b7eca2d9c8560c221cffd41492f03

Conflicts:
	.gitignore
	Superuser/AndroidManifest.xml
	Superuser/jni/Application.mk
	Superuser/jni/su/su.h
	Superuser/project.properties
	Superuser/src/com/koushikdutta/superuser/util/SuHelper.java