handle trailing slashes inside oPath#Rename

previously the RenameCurrent() view function was removing trailing
slashes from the destination path before passing it to oPath, now oPath
handles the slashes

plugin/NERD_tree.vim

@@ -308,7 +308,8 @@ endfunction
 "FUNCTION: oTreeFileNode.Rename {{{3 
 "Calls the rename method for this nodes path obj 
 function! s:oTreeFileNode.Rename(newName) dict
-    call self.path.Rename(a:newName)
+    let newName = substitute(a:newName, '\(\\\|\/\)$', '', '')
+    call self.path.Rename(newName)
     call self.parent.RemoveChild(self)
 
     let parentPath = self.path.GetPathTrunk()
@@ -2843,8 +2844,6 @@ function! s:RenameCurrent()
         return
     endif
 
-    let newNodePath = substitute(newNodePath, '\/$', '', '')
-
     try
         let bufnum = bufnr(curNode.path.Str(0))