34debf7a6d Modify .travis.yml to explictly pass no in env vars instead of setting to nothing (Elichai Turkel)
ef37761fee Change travis.sh to check if variables are equal to yes instead of not-empty. Before this, setting `VALGRIND=wat` was considered as true, and to make it evaluate as false you had to unset the variable `VALGRIND=` but not it checks if `VALGRIND=yes` and if it's not `yes` then it's evaluated to false (Elichai Turkel)
Pull request description:
ACKs for top commit:
real-or-random:
ACK 34debf7a6d
jonasnick:
ACK 34debf7a6d
Tree-SHA512: 91becfbc9cb7587ee55b2bceb604ea0aed8860990d63a5f414b11db92180c090ea8bcc048c2fb67a094e892138e3be46f00562bf78b7c3369232457289cde447