Endpoint protocol and secure updates

[mmulholla]

1. Currently the endpoint protocol is limited to "http", "ws", "tcp", "ws". This should be expanded to include "https" and "wss"

2. The description for the secure flag should be updated to make it clear that when it is set to true the protocol should be set to either https or wss.

Note also that parser documentation must make it clear that when the protocl is set, for example, to http, and the secure attribute is set to true it is the responsibilty of the consumer of the parser to convert http to https.

This was discussed in the dev file cabal on Nov 19th: https://docs.google.com/document/d/1Zn6D1gNu1gDidtillni0hNAeU5pscfqwhx4mv3MmmwY

[mmulholla]

I created a branch with some changes. You can see them here:

master...mmulholla:protocolUpdates

Would appreciate feedback before I create a pull request. Also I am not sure if other changes are needed.

[mmulholla]

This is now complete