Request: Add option for keeping cursor on filename when navigating through tree

[delbonis]

Currently when the cursor is on a directory name and you move down into the open directory, the cursor will start to float to the left of the tree. This is harmless and you're still functionally on the line of the filename to the right of the cursor, but it looks kinda strange. So I like to have cursor move to always point to the first character of the file/directory name when you change lines with n/p or the arrow keys.

I'm not sure if there's another way to do this from my own .emacs without actually modifying neotree, but it would be really great.