Modify ProGuard rules to automatically shrink object files

OpenKeychain/proguard-rules-base.pro

@@ -0,0 +1,17 @@
+# Documentation for ProGuard:
+#   http://developer.android.com/guide/developing/tools/proguard.html
+#   http://proguard.sourceforge.net/
+
+-dontoptimize
+-dontpreverify
+
+-dontnote **
+
+-keepattributes **
+
+-keep class org.sufficientlysecure.keychain.** { *; }
+
+# * Obfuscate android.support.v7.view.menu.** to fix Samsung Android 4.2 bug
+#   https://code.google.com/p/android/issues/detail?id=78377
+# * Disable obfuscation for all other classes
+-keepnames class !android.support.v7.view.menu.**, ** { *; }