adjust confirmation to be clear that you're confirming to save the file. refs #15
prompts for confirmation of CFN action (create/update/delete)
makes inquirer prompting much more configurable. refs #10
Merge pull request #19 from mapbox/confirmation

Adjust confirmations
Merge pull request #23 from mapbox/more-overrides

Various prompting overrides
--help flag always shows help and exits.
Ignore NoEcho params that come off existing stack. Fixes #26.
Merge branch 'master' of github.com:mapbox/cfn-config into cred-override

Conflicts:
	bin/config.js
	bin/create.js
	bin/delete.js
	bin/info.js
	bin/update.js
Document setCredentials()