PR for addQueryFactorySubselect depricated method

apex-enterprise-patterns#92

This was discussed and closed out earlier, but I don't see any evidence of the new methods in the project. The code coverage is a bit low on the fflib_SObjectSelectorTest but I'll see if I can improve that and get a PR in for that too.

Author: daveerickson

fflib/src/classes/fflib_SObjectSelector.cls

@@ -350,6 +350,23 @@ public abstract with sharing class fflib_SObjectSelector
     		includeSelectorFields);
     }
 
+	/**
+	 * Adds a subselect QueryFactory based on this selector to the given QueryFactor, returns the parentQueryFactory
+	 **/
+	public fflib_QueryFactory addQueryFactorySubselect(fflib_QueryFactory parentQueryFactory, String relationshipName)
+	{
+		return addQueryFactorySubselect(parentQueryFactory, relationshipName, TRUE);
+	}
+
+	/**
+	 * Adds a subselect QueryFactory based on this selector to the given QueryFactor
+	 **/
+	public fflib_QueryFactory addQueryFactorySubselect(fflib_QueryFactory parentQueryFactory, String relationshipName, Boolean includeSelectorFields)
+	{
+		fflib_QueryFactory subSelectQueryFactory = parentQueryFactory.subselectQuery(relationshipName);
+		return configureQueryFactory(subSelectQueryFactory, m_enforceCRUD, m_enforceFLS, includeSelectorFields);
+	}
+
     /**
      * Constructs the default SOQL query for this selector, see selectSObjectsById and queryLocatorById
      **/    
@@ -415,4 +432,4 @@ public abstract with sharing class fflib_SObjectSelector
 
         return queryFactory;    
     }    
-}
+}