Create customisable readers
---------------------------

                 Key: FOR-943
                 URL: http://issues.apache.org/jira/browse/FOR-943
             Project: Forrest
          Issue Type: Improvement
          Components: Forrest2
            Reporter: Ross Gardler


The Affiliate Product Catalogue example of Forrest 2 creates a reader for files 
of XML format that do not have a provided schema with which to identify further 
processing steps.

This class should become a Spring Bean that allows customisation of the 
generated document type and the psuedo protocol used to select it, e.g.
 
<bean id="fooProtocol"
                
class="org.apache.forrest.examples.affiliateProductCatalogue.reader.TradeDoublerReader"
 >

  <property name="docType"
                    value="org.foo.Bar" />

</bean>

This reader should then delegate to a second reader to actually retrieve the 
document. So we can have locationmap entries such as:

<location pattern="classpath/foo.*">
    <source href="fooProtocol:classpath:/xdocs/exampleFeed.xml"/>
</location>

<location pattern="file/foo.*">
    <source href="fooProtocol:file:/xdocs/exampleFeed.xml"/>
</location>

<location pattern="http/foo.*">
    <source href="fooProtocol:http:/xdocs/exampleFeed.xml"/>
</location>

etc.

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