Conflicts:
package.json

Fix reverse iteration edge case

Added isolation so that read stream keys are not affected by puts/deletes

Add basic insert/delete benchmarks

These don’t actually benchmark MemDOWN directly, but rather compare
different strategies for ins...

Use a binary search to determine insert/delete position for _keys

This results in a ~60x speed increase when dealing with thousands of
items

Update badgers

remove all fn#bind

iterator: fix start after db end handling