OpenCV 2.4.4 preparation

Manager verison incremented;
Additional constatnt for library intialization added;
Documents updated.

modules/java/generator/src/java/android+OpenCVLoader.java

@@ -17,6 +17,11 @@ public class OpenCVLoader
      */
     public static final String OPENCV_VERSION_2_4_3 = "2.4.3";
 
+    /**
+     * OpenCV Library version 2.4.4.
+     */
+    public static final String OPENCV_VERSION_2_4_4 = "2.4.4";
+
     /**
      * Loads and initializes OpenCV library from current application package. Roughly, it's an analog of system.loadLibrary("opencv_java").
      * @return Returns true is initialization of OpenCV was successful.