<NME> config.pro
<BEF> ADDFILE
<MSG> Made joda-convert optional

Also included instructions/sample on how to proguard when not including
joda-convert.

<DFF> @@ -0,0 +1,3 @@
+# Proguard configuration if not including joda-convert
+-dontwarn org.joda.convert.FromString
+-dontwarn org.joda.convert.ToString

Made joda-convert optional