Hey guys.
I don't know if this is the right place, but if it is not I still hope it reaches the right person.
In your 3.0.0 release you have a bug: initOpenCVLibs wants to load the library opencv_java, but it needs to be opencv_java3.
Hope this helps, as it took me quite some time to fix it (and it was more an accident that I stumbled upon this discrepancy.. So I am sure there are a few people out there that won't get their openCV to run and don't know why...)
Cheers, Fabian