chore(travis): verify commit message format for everything pushed

Now not only PRs – should help with not pushing to master things that
break PRs.

.travis.yml

@@ -8,7 +8,7 @@ os:
  - osx
 
 script:
-- if [[ "$TRAVIS_PULL_REQUEST" != "false" ]] && [[ "$TRAVIS_OS_NAME" == "linux" ]]; then bash ./verify-commit-messages.sh "$TRAVIS_COMMIT_RANGE" ; fi
+- if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then bash ./verify-commit-messages.sh "$TRAVIS_COMMIT_RANGE" ; fi
 - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then bash ./.travis/build-ubuntu_14_04.sh; fi
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then bash ./osx/qTox-Mac-Deployer-ULTIMATE.sh -i ; fi
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then bash ./osx/qTox-Mac-Deployer-ULTIMATE.sh -b ; fi