It might actually be better with interfaces
Merge branch 'master' of github.com:lemire/bytebuffer-collections

Conflicts:
	src/main/java/com/metamx/collections/spatial/bitmap/WrappedImmutableConciseBitmap.java
	src/main/java/com/metamx/collections/spatial/bitmap/WrappedImmutableRoaringBitmap.java