Add ability to set bind address for broadcasting.

Before this change, the default broadcast may not hit the desired interface.
Now the :bind option is used by broadcast sockets (was already used for listening), allowing targeting specific addresses/interfaces.
Set the :bind option, either globally, or when creating producers/consumers, if needed.

Fix filtered first_only search issue.

Fixes Issue #6

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Prior to 1.1.7, doing a Consumer search with all of [:first_only, :filtered, :timeout] will return a result that does not pass the filter if

• at least one SSDP message is received, that does not pass the filter
• no messages that do pass the filter are received
• the search times out

Fix M-SEARCH.

1.1.5

Cleanup Search Requests; Bump Version

SO_REUSEPORT - Windows fix

Merge pull request #3 from daumiller/soreuse

SO_REUSE* cross-platform