Tests for IMAP FETCH

Adding regression test for the new IMAP parser.

Change-Id: Iac7f5c022e44ca5f06f735e145af15cc459eb61f
diff --git a/proguard.flags b/proguard.flags
index bbffc8a..f3b7e57 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -23,9 +23,9 @@
 
 -keep class * extends org.apache.james.mime4j.util.TempStorage
 
-
 # Keep names that are used only by unit tests
 
+# Any methods whose name is '*ForTest' are preserved.
 -keep class ** {
   *** *ForTest(...);
 }
@@ -172,3 +172,7 @@
 -keep class org.apache.james.mime4j.message.Message {
   *;
 }
+
+-keepclasseswithmembers class org.apache.commons.io.IOUtils {
+  *** toByteArray(...);
+}