* [test] use the new Api instead of deprecated Apis.
+ test hooks with range object.
* minor changed.
* update readme
* [bug] codec/index should return PATH_SEP by attribute getter
* [feature] path.join arguements can be mixture with array and string now
* use the new path.join on codec/index.js
- do not close db on subkey.close
* use setImmediate wrapped simply
* update readme
* [bug] correct the separator checking on key path
* update version to 7.8.2
Merge branch 'release/7.8.2'