adding https option for running with TLS/SSL

This addresses issue #86 by adding the option to configure express using https instead of http. The 'all' and 'production' environment configuration includes a property named 'secure' to enable https.
I am going to add -aes256 to encrypt the private key with specified cipher before outputting it. Also planning to add 1024 numbits option to increase the size of the private key to generate in bitsoption instead of default 512.