Update .travis.yaml: No need cleanup the test environment.
Update .travis.yaml: Run test on PHP 5.5 and hhvm too.
Update .travis.yaml: Run test on PHP 5.5 and hhvm too.
Yaml .travis.yml: at_base module does not need be enabled by default.
Revert "Yaml .travis.yml: at_base module does not need be enabled by default."

This reverts commit 18164034a273f4fd09f932f1b37acf7b316793b3.
unzip command is too noisy.
unzip command is too noisy > Fix wrong param.
Merge pull request #61 from andytruong/features/try-drush-test-run

Features/try drush test run