Updated proposal for (as yet) unumbered issue: Need fault to indicate that security constraints have been violated

Attached is an updated proposal for the security fault issue. It is
provided in the form of a change-bar version of wsrm-1.1-spec-wd-15. The
changes are against the 7/28 version of the document (#44 in Kavi's list
of revisions).

There are three additions to the spec. Section 4.10 has been added to
describe the wsrm:SecurityViolation fault. A paragraph has been added to
section 6.1 that describes when the fault may be used. A similar
parapgraph has been added to section 6.2 to describe the possible use of
the fault when protecting a Sequence using SSL/TLS.

- gp