Added explicit discussion of several encrypted env var things that confused me
Added notifications example
Added @henrikhodne's description of how secure vars work.

Added @henrikhodne's description of how secure vars work.

The page may now be a little redundant, and some of it isn't poetry, but I think redundant and explicit is better than ambiguous.
Merge pull request #250 from mharris717/encrypted_env

Added explicit discussion of several encrypted env var things that confused me