Fix error:

Test Drupal\at_base\Autoloader::fetchModuleInfo() failed: Non-static
method Drupal\at_base\Autoloader::fetchModuleInfo() should not be
called statically
Merge branch '6.x-2.x' of github.com:andytruong/at_base into 6.x-2.x

* '6.x-2.x' of github.com:andytruong/at_base:
  No cache_bootstrap in D6.
  Update .travis.yml
  Update .travis.yml
  Do not add/remove tags if no tag is specified.
  Fix #29