code cleanup (synchronization with C++ version)
Merge branch 'master' into beta
since 1.7.3 we will not use proguard for apk obfuscation
VERSION => 1.7.3
Merge branch 'master' into beta

Conflicts:
	AndroidManifest.xml
	ChangeLog
	project.properties
no force start for library service
Merge branch 'master' into beta