upgrading protobuf-net to 668
regen'd Riemann with Attributes
add ability to specify host for an event, as well as use Attributes for custom key/value string pairs
include attributes when populating proto msg
make hostname an optional argument for sending events
merged PR #9
update IClient to also make host optional so as not to break existing callers
insure that hostname is set to the local FQDN in in the proto event if unset by the caller