only check alive connections for redistributing RDY (causes constant RDY send when a dead connection exists)
Merge pull request #31 from jehiah/rdy_fix_31

RDY messages re-sent when a failed connection exists
SSL_ERROR_WANT_WRITE now causes us to send the same buffer on the next request
Merge pull request #30 from dlecocq/dan/ssl-wants-write

SSL_ERROR_WANT_WRITE sends same buffer
When a client has no connections, its read should not busy-wait