Change license to MIT

Due to some requests to loosen the licensing on this lib, to make it easier to use for other projects, I'd like to suggest change to MIT license. If I understand the process correctly we can do that if all the contributors agree. Therefore I'd like to ask @tstrachota, @domcleal and @komidore64 for ACK or NAK.

DO NOT MERGE before the packaging for RPMs and DEBs is finished