[Solr Wiki] Update of "DataImportHandler" by NoblePaul

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The following page has been changed by NoblePaul:
http://wiki.apache.org/solr/DataImportHandler

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  the class 'Foo' must extend the abstract class `org.apache.solr.hander.dataimport.Transformer` The class has only one abstract method.
  
+ The transoformer attribute can take in multiple transformers (`say transformer="foo.X,foo.Y"`) separated by comma. The transformers are chained in this case and the chain is applied one after other in the order in which it is specified. 
+ 
  {{{
  public abstract class Transformer {
    /**