Fix cmdline expand keyword to use cmd.name.
Merge pull request #21 from yoshikaw/master

コマンドに渡す文字列が正しく生成されない
fix URL regexp a bit in s:get_url_on_cursor() (ref: #22)
escape '!' also for ':!start' (thanks @basyura)

via https://twitter.com/basyura/status/313504583647371264
fix comment in the previous change
vitalize (for Vital.Process.system_bg())
remove '&' from g:openbrowser_browser_commands in all platforms
Merge branch 'change-browser-commands-default'