Minify Json

[eschuchmann]

• cfn commands always use minified json (to avoid amazon size limits)
• expand command now has optional '--minify true' to generate minified output

[eschuchmann]

Note: this PR has the side effect of no longer generating an expanded template file when running the expand command (this appeared to be a mistake, but some people might be relying on that behavior)

[jonaf]

This looks fine. Ideally we'd not have to add true to this and just use minify. We'll ignore the fact that minify might ordinarily also make changes like rename variables and functions, etc. I don't currently have any knowledge of a use-case where the expand sub-command is used to generate a JSON template file; but to restore that functionality if it is desired, a user can simply redirect stdout to a file.

For clarity, the primary motivation for this change is to allow for even larger CloudFormation templates.

[shawnsmith]

I think this needs to be updated so that diff is still useful since standard diff doesn't work well w/compact (non-pretty printed) json.