added property maxAllowedViolations pull request on findbug.

[Ranjodh-Singh]

hi I have raised a pull request to findbug maven plugin to add maxAllowedViolations configuration property - pull-request-link-here . Since findbug is no longer maintained, Can I raise the same change request to spotbug since it's maintained.
Property maintained is similar to checkstype property to ignore the number of violations. Use Case arrived when we have multiple teams working on it and we couldn't have everything fixed in one release so we decided to keep the old ones and no introduce the new ones till we plan the fix release for the older violations. Let me know so that i can re-raise the request here. I believe it might be a useful option to have. it can also partially solve - #55

[ksnortum]

I thought we were using Sonar as our "bug finder."

[Ranjodh-Singh]

@ksnortum i think right home for this issue/feature would be https://github.com/spotbugs/spotbugs-maven-plugin/. will follow up there.