[Bug 85725] Add a setting to hide the launchpad menu items

[Vincent Untz]

Public bug reported:

Binary package hint: liblaunchpad-integration0

It's good to have launchpad integration, but some people might want to
hide them (for example, when they want to show an upstream desktop, or
if they disagree with the use of launchpad for some reason).

There should be a global gconf key that this lib would look at to know
whether the menu items should be added or not.

** Affects: launchpad-integration (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Add a setting to hide the launchpad menu items
https://launchpad.net/bugs/85725