Idea for improving the deploy.sh script

[edrandall-dev]

A few possible improvements to the deploy.sh script:

• separate sections for user configurable variables and those which most users shouldn't need to change
• usage function
• ensuring that the script only takes a single argument, the desired stack name
• created a binary for the 'aws' binary incase it is installed in a non-standard location (and checks to see that it's in PATH)