readme tweak
do not match revision when unpacking apklib/aar
Always unpack aar/apklib if AndroidManifest.xml is missing
1.2.17: minor bugfixes

disable proguard cache if proguardCache is empty
allow wildcard versions for aar/apklib consumption
force unpack of aar/apklib if missing AndroidManifest.xml
 (for windows' stupid exclusive locks)
0.13 changes
0.13 changes for 0.9.2
0.13 changes for test hello-world-oscarvarto