level-incr

level-incr
==========

add an atomic increment/decrement command to a level db

$3

path the db object with incr and decr

$3

you may optionally oass incrStart if you need to do something like odd/even

$3

increment the key by one

$3

increment the key by amount

$3

decrement the key by 1

$3

decrement the key by amount