[feature] skip a visual test

[DimitarChristoff]

So, I have a few components that use spinning animations and every time the test runs, it catches the spinner at a different phase, causing false positives.

I would like to be able to skip an example or a particular element from being considered in the screenshots.

[unindented]

The other option (the one we use in our current project) is to disable animations by injecting a CSS file with the following contents:

* {
  animation: none !important;
  transition: none !important;
}

[kot-lex]

I guess this could be possibly implemented by adding custom action type named "skip"

[jkarttunen]

I think the filter argument is for that:
https://github.com/unindented/react-styleguidist-visual/blob/master/src/commands/test.js
--filter "spinner" "spinner2" or something like that