Add option ShowDefault

[shumkovdenis]

If option ShowDefault, then field should show without "groups" tag.

[coveralls]

Coverage increased (+0.4%) to 82.759% when pulling 77636c9 on shumkovdenis:master into 05500a8 on liip:master.

[coveralls]

Coverage increased (+0.4%) to 82.759% when pulling f99648f on shumkovdenis:master into bb4d97c on liip:master.

[mweibel]

hi @shumkovdenis
Thanks for your contribution!

I think a feature like this makes sense, but I'm unsure about the implementation. Could you say something about your use case?
Also ShowDefault is not a great naming IMO. Maybe together with clarifying the use case we could find a better name.

[shumkovdenis]

There are many fields in my structure and I would not like to, for each field, specify a tag if this field is valid for all groups. And so you can add to the configuration options with which we specify that by default to show all the fields.

[mweibel]

Hi,
This conflicts now with current master. Sorry that it took me way too long to come back to you!
Anyway are you still in need of this feature?
Please add tests if you continue to do so. Also add godoc comments as well as a README update.

[masseelch]

I can provide a PR that implements this on another way, if you are willing to merge it. This can be closes than too. Two years have passed since this was opened.

[mweibel]

closing. replaced by #29