Added LinphoneCallLog interface previously exported JNI method

java/common/org/linphone/core/LinphoneCallLog.java

@@ -96,4 +96,9 @@ public interface LinphoneCallLog {
 	public CallStatus getStatus();
 	
 	public long getNativePtr();
+	
+	/**
+	 * @return a human readble String with the start date/time of the call
+	 */
+	public String getStartDate();
 }