Commandline arg handling is nonintuitive

[peterbourgon]

• -h and --help currently yield stack traces. These are common flags that should be supported :)
• Long flag names, eg. --url, typically accept their values after an =, eg. --url=http://host:9200. Currently, this yields an exception.
• The output of most commands is a long string of context-specific values, and therefore unreadable without --verbose. It's more idiomatic to output verbose by default, and reserve a --quiet or --compact flag to make it machine-parseable.