Revert "- add proguard option"

This reverts commit 259cd68.

Author: gun0912

tedpermission/proguard-rules.pro

@@ -15,8 +15,3 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
--keepattributes *Annotation*
--keepclassmembers class ** {
-@com.squareup.otto.Subscribe public *;
-@com.squareup.otto.Produce public *;
-}