If file path doesn't exist, :NERDTreeFind its parent directory instead. (#1043)

* If file path doesn't exist, :NERDTreeFind its parent directory instead.

This happens in the following scenario:
```
:edit path/new_file
:NERDTreeFind
```
Instead of an error message about an **invalid path**, this change will
now find the parent directory instead. It will not work if the new file
is **path/new_folder/new_file**, and that's OK because even vim itself
cannot handle both the new folder and the new file; `:w` won't create
the new folder.

* Update version number in change log.

* Change version change from PATCH to MINOR.

autoload/nerdtree/ui_glue.vim

@@ -284,6 +284,9 @@ endfunction
 " FUNCTION: s:findAndRevealPath(pathStr) {{{1
 function! s:findAndRevealPath(pathStr)
     let l:pathStr = !empty(a:pathStr) ? a:pathStr : expand('%:p')
+    if !filereadable(l:pathStr)
+        let l:pathStr = fnamemodify(l:pathStr, ':h')
+    endif
 
     if empty(l:pathStr)
         call nerdtree#echoWarning('no file for the current buffer')