handle special properties like __proto__
update README.md
+ use path spec in codec/index.js
* rename sublevel.prefix() to sublevel.name()
+ sublevel.path()
 rename sublevel.prefix() to sublevel.pathAsArray()
*[bug] forget to modify the op.prefix to op.path in nut.apply
+ keyPath supports
+ [test] test/sublevel-path-get.js
+ exports.getPathArray = getPathArray
+ exports.pathArrayToPath = pathArrayToPath
+ exports.resolveKeyPath = resolveKeyPath
+ sublevel.setPath()
+ internal _addHook function on sublevel for pre and post to add hook
  * the hook search key can use relative key path now.
* stream can use custom path,
+ wildchar(minimatch) support on range
* update readme
+ options.absoluteKey: if true return the key as absolute key path.
* update readme
* minior desciption added
* [bug] mergeOptions can not merge null/emptystring attribute
* createReadStream use options.start to speedup iterator
* update readme
Merge remote-tracking branch 'rvagg/special-words' into feature/KeyPath
+ rename internal sublevels to _sublevels and add the sublevels property getter and setter to keep compatibility.
* update readme
* [bug] forget local var result in sublevels getter