added "request_memory" parameter to switch on/off the memory requirement
only specify request_memory if enabled, otherwise set to 0
Merge pull request #25 from kreczko/request-memory

Request memory
added "email_domain", "default_domain_name" and "filesystem_domain" parameters
added "DEFAULT_DOMAIN_NAME" and "FILESYSTEM_DOMAIN" parameters
changed "localhost" to the email_domain parameters for "EMAIL_DOMAIN"