Merge pull request bitcoin#464 from sipa/bip141start

BIP 141 start and end time

Author: luke-jr

bip-0141.mediawiki

@@ -299,7 +299,7 @@ As a soft fork, older software will continue to operate without modification.  N
 
 This BIP will be deployed by "version bits" BIP9 with the name "segwit" and using bit 1.
 
-For Bitcoin mainnet, the BIP9 starttime will be midnight TBD UTC (Epoch timestamp TBD) and BIP9 timeout will be midnight TBD UTC (Epoch timestamp TBD).
+For Bitcoin mainnet, the BIP9 starttime will be midnight 15 november 2016 UTC (Epoch timestamp 1479168000) and BIP9 timeout will be midnight 15 november 2017 UTC (Epoch timestamp 1510704000).
 
 For Bitcoin testnet, the BIP9 starttime will be midnight 1 May 2016 UTC (Epoch timestamp 1462060800) and BIP9 timeout will be midnight 1 May 2017 UTC (Epoch timestamp 1493596800).