[WIP] Live omit

[epicfaace]

Reasons for making this change

Add a liveOmit option. I have a use case in which I want omitExtraData to happen during onChange, but I do not want liveValidate.

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests
  • I've updated docs if needed
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[epicfaace]

@CodeGains it turned out I had to include this for my use case -- if we end up having a liveOmit property, do you think it's still necessary to automatically live omit when liveValidate is true? Or would that end up complicating things and might it be better just to only live omit when liveOmit is true (regardless of the value of liveValidate)?

[CodeGains]

@epicfaace I think it makes sense to only live omit when liveOmit is set so we don't force the live omit functionality on a user that just wants to liveValidate.

[epicfaace]

Thanks -- good point, will do that.