Merge branch '2.5' into 2.6
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 000d5b0..00053a7 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -66,7 +66,7 @@
 - Add `JsonParser.Feature.IGNORE_UNDEFINED`, useful for data formats like protobuf
 - Optimize writing of String names (remove intermediate copy; with JDK7 no speed benefit)
 
-2.5.5 (not yet released)
+2.5.5 (07-Dec-2015)
 
 #220: Problem with `JsonParser.nextFieldName(SerializableString)` for byte-backed parser
 #221: Fixed ArrayIndexOutOfBounds exception for character-based `JsonGenerator`
diff --git a/src/main/java/com/fasterxml/jackson/core/Version.java b/src/main/java/com/fasterxml/jackson/core/Version.java
index 48b9163..884d3d7 100644
--- a/src/main/java/com/fasterxml/jackson/core/Version.java
+++ b/src/main/java/com/fasterxml/jackson/core/Version.java
@@ -65,6 +65,10 @@
     public static Version unknownVersion() { return UNKNOWN_VERSION; }
 
     public boolean isUknownVersion() { return (this == UNKNOWN_VERSION); }
+
+    // Added in patch 2.6.6 (added for good in 2.7)
+    public boolean isUnknownVersion() { return (this == UNKNOWN_VERSION); }
+
     public boolean isSnapshot() { return (_snapshotInfo != null && _snapshotInfo.length() > 0); }
     
     public int getMajorVersion() { return _majorVersion; }