BIPs 30, 32, 62, 66, and 103: License under BSD-2-Clause terms

``` [Thursday, January 19, 2017] [7:46:36 PM UTC] <luke-jr> sipa: if you get a minute, can you give me at least a text-"verbal" ACK for some copyright license to put on BIPs 30, 32, 62, 66, and 103 please? is BSD-2-Clause okay? [Thursday, January 19, 2017] [7:47:01 PM UTC] <sipa> luke-jr: ACK on 2-clause BSD for 30,32,62,66,103 [Thursday, January 19, 2017] [7:47:13 PM UTC] <sipa> (and for any other BIPs I contributed to) ```

Specification