Fail MSRP stream if there are no TLS credentials to act as server

Ignore-this: 89a69fbeed63617dca41a73ce4b69644

darcs-hash:20091130175841-1e3d8-1661351472d97b8e2ae31a2a4cb17474d1ea4aca
Increased version number to 0.11.0

Ignore-this: 2b61f00dc5666cc199dc4a97854b8ec3

darcs-hash:20091201013654-b22ec-7f7c002d00327b04abd0fc324679ed1d31a54e3a