Re-added csv test.
Private-ize and final-ize internal fields of DataType.
Added toString() to get the value of supported object in String.
Added isSupported() to check if object is supported.
Private-ize and final-ize internal fields of DataType.
Added toString() to get the value of supported object in String.
Added isSupported() to check if object is supported.
Remove BeanData interface because it's no longer needed.
Remove Extractable interface because it's no longer needed (only has 1 implementation)
Change MBeanExtract.extract() to static because it doesn't have any significant state meaning.