Add failOnError property

[BBE78]

It could be useful to avoid a build break when using the plugin. I propose to add a failOnError boolean property (set to true by default for backward compatibility).

[mrice]

Hey @BBE78 --

So sorry for the delay on this one... hmmmm... I understand your point, but my thinking with breaking the build is that it should commit this kind of violence (breaking it) on your build to make engineers pay attention to the issue. Personally, I feel like nobody worries about charging up the tech debt credit card with a bunch of warnings.

But you do have a point, and the way you address it seems like a good one (making it default)

[mrice]

@BBE78 my only issue right at the moment is time... think you can take a stab at it?