UPDATES

+ Some URL pattern changes in manager page
+ Added widget recent comments and related posts, make the widget looks
better when there is no posts available (a new blog).
+ Disable **Less** button if the previous form fields is not empty.
+ Add advanced file lister methods in `Get` class.
+ Tidy up.
+ Replace all `/` separator in file operation functions with the `DS`
constant so that I can sleep better next time.