Added getDoc() method to KrillIndex for field retrieval

Change-Id: I17628024f74081e86f400d9fc52c031fbb0df815
diff --git a/Changes b/Changes
index 64087df..3b39a83 100644
--- a/Changes
+++ b/Changes
@@ -8,6 +8,7 @@
         - [documentation] Refer to KoralQuery instead of Koral (diewald)
 	- [cleanup] Removed deprecated method in KrillCollection:
 	  getCount() (diewald)
+	- [feature] Added getDoc() method to KrillIndex (diewald)
 
 0.55.5 2016-05-02
 	- [performance] Changed to a dynamic window for sorting in FocusSpans (margaretha)