* The methods stream_write and stream_read are not supported by moto yet
 * The s3_access_key and s3_secret_key must be lower case in order to perform the tests.
 - Removed the test/s3.py file
 - Added a little trick to the function get_size() from S3Storage() class

- Added to the load() method from storage a custom config_data support
- Added method check_env_variables() which checks if the environment variables exist in order to avoid error during the s3_storage tests
- Created a patched version of get_size() method on test_s3.py file
- Removed the patch from the S3Storage() class
- Added the moto library to the requirements file
- Added missing decorator above test_errors() method