[Pig Wiki] Update of "PigStreamingFunctionalSpec" by OlgaN

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The following page has been changed by OlgaN:
http://wiki.apache.org/pig/PigStreamingFunctionalSpec

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   1. !BinarySerializer, !BinaryDeserializer - treats the entire file as byte 
stream - no formating or interpretation.
   2. !PythonSerializer, !PythonDeserializer 
  
- Each deserializer will be implementing `LoadFunc` interface. Each serializer 
will be implementing `StoreFunc` interface. `StoreFunc` interface will be 
extended with `void flatten() throws OperationNotSupportedException;` method 
that would indicate that the data needs to be flattened before it is 
serialized. The class can choose not to support this functionality and through 
an exception.
+ Each deserializer will be implementing `LoadFunc` interface. Each serializer 
will be implementing `StoreFunc` interface. 
  
  ==== 3.2 Ability to declare schema for streaming output ====