Ignore .bundle directory.

This commit refs #24.
Specify the version of the openvpn cookbook.

In order to generate the keys,
specify the version of the openvpn cookbook.

This commit refs #24.
Generate the keys, by removing the unnecessary lines.

This commit ref #24.
Modify the README.md.

In order to
illustrate how to install the dependent libraries,
modify the README.md.

This commit refs #24.
Modify the option of the `sed` command.

In order for Mac client to parse the options properly,
modify the option of the `sed` command.

This commit refs #24.
Disable Berkshelf integration with knife-solo.

In order not to newly download the cookbooks,
disable the Berkshelf's integration with knife-solo.

This commit refs #24.
Modify the `cookbooks/openvpn/recipes/users.rb` only once.

Modify the `cookbooks/openvpn/recipes/users.rb` only once,
even if we execute `rake init` command more than once.

This commit refs #24.
Merge pull request #24 from kazu634/id/24

Chef-SoloでもOpenVPNをインストールできるようにする