[CLI-224] Added default Builder constructor.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/cli/trunk@1444753 13f79535-47bb-0310-9956-ffa450edef68

Author: netomi

src/main/java/org/apache/commons/cli/Option.java

@@ -789,6 +789,14 @@ public static class Builder
         /** the character that is the value separator */
         private char valuesep;
 
+        /**
+         * Constructs a new <code>Builder</code>.
+         */
+        public Builder()
+        {
+            this(null, null);
+        }
+
         /**
          * Constructs a new <code>Builder</code> with the minimum
          * required parameters for an <code>Option</code> instance.