Implemented much of the easy stuff.
Implemented much of the easy stuff.

RoaringBitmap/RoaringBitmap,gssiyankai/RoaringBitmap,okrische/RoaringBitmap,lemire/RoaringBitmap,gssiyankai/RoaringBitmap,lemire/RoaringBitmap,gssiyankai/RoaringBitmap,RoaringBitmap/RoaringBitmap,RoaringBitmap/RoaringBitmap,RoaringBitmap/RoaringBitmap,lemire/RoaringBitmap,okrische/RoaringBitmap,okrische/RoaringBitmap,lemire/RoaringBitmap