model-wire: Fixing compliance with CCNb format regarding Content tag

Previously, content didn't contain a proper BLOB tag

Refs #1020 (http://redmine.named-data.net/issues/1020)
diff --git a/model/wire/ccnb/ccnb-parser/syntax-tree/block.h b/model/wire/ccnb/ccnb-parser/syntax-tree/block.h
index caf227f..dcaadaf 100644
--- a/model/wire/ccnb/ccnb-parser/syntax-tree/block.h
+++ b/model/wire/ccnb/ccnb-parser/syntax-tree/block.h
@@ -53,11 +53,13 @@
    * \brief Parsing stream (recursively) and creating a parsed BLOCK
    * object
    *
-   * \param start buffer iterator pointing to the start position for parsing 
+   * \param start buffer iterator pointing to the start position for parsing
+   * \param dontParseBlock parameter to indicate whether the block should not be parsed, just length
+   *                       of the block should be consumed (e.g., in case of "cheating" with content of Data packets)
    * \returns parsed ccnb-encoded block, that could contain more block inside
    */
   static Ptr<Block>
-  ParseBlock (Buffer::Iterator &start);
+  ParseBlock (Buffer::Iterator &start, bool dontParseBlock = false);
 
   virtual ~Block ();