When I open a file in vim, vim-nodejs-complete doesn't provide any auto-completion for modules located in my 'node_modules' directory. It does provide auto-completion for all base modules. If I type in the command ":unlet b:npm_module_names", the response is: "No Such Variable: b:npm_module_names". Is there some way to get it to autocomplete my modules stored in the 'node_modules' directory?