Specify the license and update README.md

LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Yuta Nagamiya
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

@@ -4,24 +4,29 @@ The **Vim RuboCop** plugin runs [RuboCop](https://github.com/bbatsov/rubocop) an
 
 ## Requirements
 
-- Please note that the current version of the Vim RuboCop plugin requires RuboCop 0.12.0 or later.
+Please note that the current version of the Vim RuboCop plugin requires RuboCop 0.12.0 or later.
 
 ## Installation
 
-- Obtain a copy of this plugin and place `rubocop.vim` in your Vim plugin.
+Obtain a copy of this plugin and place `rubocop.vim` in your Vim plugin directory.
 
 ## Usage
 
-- You can use the `:RuboCop` command to run RuboCop and display the results.
+You can use the `:RuboCop` command to run RuboCop and display the results.
 
-- To run with specified config file add this line to your `.vimrc` file:
+You can also use the `:RuboCop` command together with options. For example, `:RuboCop -l`, `:RuboCop -a` and so on.
 
-    ```viml
-    let g:vimrubocop_config = '/path/to/rubocop.yml'
-    ```
+### Configuration File
 
-### Keyboard Shortcuts ###
-  Credit for Shortcuts: [Ack.vim](https://github.com/mileszs/ack.vim)
+To run with the specified configuration file, add the following line to your `.vimrc` file:
+
+```viml
+let g:vimrubocop_config = '/path/to/rubocop.yml'
+```
+
+### Keyboard Shortcuts
+
+Credit for Shortcuts: [Ack.vim](https://github.com/mileszs/ack.vim)
 
 In the quickfix window, you can use:
 
@@ -46,3 +51,7 @@ your `.vimrc`:
 let g:vimrubocop_keymap = 0
 nmap <Leader>r :RuboCop<CR>
 ```
+
+## License
+
+The Vim RuboCop plugin is open-sourced software licensed under the [MIT license](http://opensource.org/licenses/MIT).

plugin/rubocop.vim

@@ -1,8 +1,10 @@
 " The "Vim RuboCop" plugin runs RuboCop and displays the results in Vim.
 "
-" Author:  ngmy
-" URL:     https://github.com/ngmy/vim-rubocop
-" Version: 0.3
+" Author:    Yuta Nagamiya
+" URL:       https://github.com/ngmy/vim-rubocop
+" Version:   0.4
+" Copyright: Copyright (c) 2013 Yuta Nagamiya
+" License:   MIT
 " ----------------------------------------------------------------------------
 
 if exists('g:loaded_vimrubocop') || &cp