Add allow-stderr for adt tests

* nose-cov print to stderr:
  2014-08-27 15:38:35,645 [nose.plugins.manager] DEBUG: DefaultPluginManager
  load plugin cov = nose_cov:Cov, which makes adt failing then. As we control
  stderr and warnings during tests, disable this check.
releasing package ubuntu-developer-tools-center version 0.0.3