add back in a template debugging command show-template
First validate JSON being handed it off to AWS, so we can catch syntax issues earlier.
cleanup and format JSON in the validate command.
remove extra line.
fix return values in validate.
make json sent as compact as possible to avoid 50K max.
pretty-print JSON in show-template if valid JSON, else return raw string.
Fixing flake8 errors
Merge pull request #213 from huit/parrott_flake8

flake8 style fixes for #212