Return a connection to DynamoDB.

def get_conn():
    """Return a connection to DynamoDB."""
    if os.environ.get('DEBUG', False) or os.environ.get('travis', False):
        # In DEBUG mode - use the local DynamoDB
        # This also works for travis since we'll be running dynalite
        conn = DynamoDBConnection(
            host='localhost',
            port=8000,
            aws_access_key_id='TEST',
            aws_secret_access_key='TEST',
            is_secure=False
        )
    else:
        # Regular old production
        conn = DynamoDBConnection()

    return conn