add a new constructor for pig storage that has offerType for usability

Author: Nomiero

src/com/microsoft/azure/documentdb/pig/DocumentDBStorage.java

@@ -57,15 +57,19 @@ public DocumentDBStorage(String masterkey, String dbName, String outputCollectio
         this(masterkey, dbName, outputCollections, null, null, null);
     }
 
-    public DocumentDBStorage(String masterkey, String dbName, String outputCollections, String rangeindexed, String upsert, String offerType) {
+    public DocumentDBStorage(String masterkey, String dbName, String outputCollections, String offerType){
+        this(masterkey, dbName, outputCollections, offerType, null, null);
+    }
+    
+    public DocumentDBStorage(String masterkey, String dbName, String outputCollections, String offerType, String rangeindexed, String upsert) {
         this.masterkey = masterkey;
         this.dbName = dbName;
         this.outputCollections =  outputCollections;
         this.upsert = upsert;
         this.rangeIndexed = rangeindexed;
         this.offerType = offerType;
 
-        //Set the userAgent to pig storage
+        // Set the userAgent to pig storage
         if (!DocumentDBConnectorUtil.UserAgentSuffix.contains(DocumentDBStorage.PIG_STORAGE_USERAGENT)) {
             DocumentDBConnectorUtil.UserAgentSuffix += DocumentDBStorage.PIG_STORAGE_USERAGENT;
         }