Add 2 new classes and move code into them from autoload:
* NERDTree. Each nerdtree buffer now has a NERDTree object that holds
the root node and will old other util functions
* UI. Each NERDTree object holds a UI object which is responsible for
rendering, getting the current node, etc
Still a fair few methods to sort through in autoload (many of which will
end up in the above classes) - need sleep though.
Allows the user to create or copy a nested node
in a single step with ma or mc, recursively
creating nested parent directories if needed, and
without throwing any errors if they already exist.
[Finishes #163, #34]
If you are renaming a file via the mm hotkey and it is already opened then all
tabs and windows containing the old file will be replaced with a
new file. Current tab and windows structure is not changed anymore
If you are deleting a file via the md hotkey and it is already open, i.e.
presents in buffer lists then a buffer will be removed but a window and tab
will be kept with a ':enew' file
Previously when you delete or moved a file via
md or mm commands the NERDTree was asking you about what to do
with the remaining buffer of the just deleted or moved file. I
always press 'y' in this cases so I've decided to add a new parameter,
NERDTreeAutoDeleteBuffer which you can set to 1 in order to skip
this confirmation.
