Add an option to disable parameterized type warnings

Hi, I know some people like these because even in Groovy they parameterize their collections, but most people don't and this leads to unnecessary warnings.

I think the best choice for this is to leave the choice to the user: just get a per-project checkbox where you can activate or deactivate these warnings. This way everyone is happy (I am not currently, as these warnings really bother me

Thanks.