Merge pull request #590 from Mkaysi/travis

.travis.yml: add Python 3.4.
Revert ".travis.yml: add Python 3.4."

This reverts commit d84f6b48344bce0c3f225d8d695680ae86bb6ff6.
.travis.yml: add Python 3.4 [DO NOT MERGE UNTIL TRAVIS SUPPORTS IT!].