Add `--jq` option to `org` sub command

[kmuto]

It would be helpful if mkr org subcommand has --jq option like other subcommands.

For example:

$ mkr org --jq '.name'
myorg
$ mkr org --jq '.displayName'
My Organization

Here is a patch to add --jq option to org subcommand and test code.

I referred the code of channels subcommand.