Add Boxen links to Welcome message
user
```ruby
class Welcome
  def execute
    speak(
      "Invite Member to Google Apps: https://admin.google.com/thirdprestige.com/AdminHome#UserList:org=1pgvlh93ky0661", 
      "Invite Member to Basecamp: https://basecamp.com/1854629/people/new", 
      "Invite Member to Campfire: https://thirdprestige.campfirenow.com/invitations/new",
      "Upgrade Harvest plan to support more users: https://thirdprestige.harvestapp.com/company/edit_plan", 
      "Add Member to Harvest: https://thirdprestige.harvestapp.com/people",
      "Add Member to GitHub: `haml authorize @HamlTheHamster",
      "Add Member to Heroku: `haml collaborate haml@thirdprestige.com", 
      "Ensure Member has signed a Sub-contractor agreement: https://na2.docusign.net/Member/EnvelopeSetup.aspx?ti=2a1554a1d86040d49aab723af894bcea&",
      "Email links to https://boxen.thirdprestige.com, https://github.com/thirdprestige/boxen"
    )
  end
end
```
assistant