Shrink some SC classes for Gingerbread dexopt limit.

// FREEBIE

proguard.cfg

@@ -1,7 +1,5 @@
 -keepattributes **
--keep class !android.support.v7.internal.view.menu.**,** {*;}
+-keep class !android.support.v7.internal.view.menu.**,!org.spongycastle.asn1.**,!org.spongycastle.crypto.ec.**,!org.spongycastle.x509.**,** {*;}
 -dontpreverify
 -dontoptimize
--dontshrink
 -dontwarn **
-