Add suppression of equals symmetric check

Because we like to use findbugs in our projects and findbugs makes it a PIA to exclude/supress warnings using maven when I want to use a shared parent pom.xml file with findbugs rules across the company I think it makes most sense to add a suppression using the annotations for this use case.

I didn't see a better way of implementing equals() without just doing full reflection.

http://findbugs.sourceforge.net/bugDescriptions.html#EQ_OVERRIDING_EQUALS_NOT_SYMMETRIC