Prepare SWORD CRUD interface

Adds stub method for DELETE request.
Implements DELETE request

!Non functional due to Axis bug in WSDL generated code!
Use generated SOAP API-A and API-M

(!) Looks like Fedora API-A implementation only works with
PostgreSQL database backend. This issue might lead to completely
removing SOAP calls and switching to Fedora REST Client library.
Use CRUD specific Exception class

There is no NOT FOUND error in SWORD spec.
Delete cached SWORD response
Merge branch 'http-delete'