Update buildscript .travis.yml, to update keys
Bugfix buildscript run_tests.sh, to insert keys of new services correctly into the configuration files
Bugfix buildscript run_tests.sh, return nosetests status code from subshell
Modify class GoogleStore, to configure gsutil automatically
Modify store_test.py, to add more tests
Modify store_test2.py, to consider eventual consistency by waiting a few seconds