Add the ability to turn on proguard for java targets, and to call aapt
to generate a rules file for proguard for stuff from the manifest and
other resources that need to be kept.
diff --git a/core/proguard.flags b/core/proguard.flags
new file mode 100644
index 0000000..afd1548
--- /dev/null
+++ b/core/proguard.flags
@@ -0,0 +1,7 @@
+# see http://sourceforge.net/tracker/?func=detail&aid=2787465&group_id=54750&atid=474707
+-optimizations !code/simplification/arithmetic
+-allowaccessmodification
+
+# Some classes in the libraries extend package private classes to chare common functionality
+# that isn't explicitly part of the API
+-dontskipnonpubliclibraryclasses