[XMLSCHEMA-30] This commit fixes the XMLSCHEMA-30 bug.

equals/hashCode methods pairs have been added in following classes:
     - XmlSchemaNamedImpl
     - XmlSchemaNamedWithFormImpl
     - XmlSchemaType
     - XmlSchemaElement
     - XmlSchemaGroup

 NamedItemsEqualityTest unit-test has been created.

git-svn-id: https://svn.apache.org/repos/asf/webservices/xmlschema/trunk@1560095 13f79535-47bb-0310-9956-ffa450edef68
Fix imports

git-svn-id: https://svn.apache.org/repos/asf/webservices/xmlschema/trunk@1560096 13f79535-47bb-0310-9956-ffa450edef68