[Pharo-project] [update 2.0] #20348

[Esteban Lorenzano]

20348
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Issue 6761:     Class side Trait methods don't work in Nautilus
        http://code.google.com/p/pharo/issues/detail?id=6761
        
Issue 6831:     unload monticello package breaks RPackage
        http://code.google.com/p/pharo/issues/detail?id=6831
        
Issue 6539:     Integrate Metacello
        http://code.google.com/p/pharo/issues/detail?id=6539

Diff information:
http://ss3.gemstone.com/ss/Pharo20/Ring-Core-Kernel-EstebanLorenzano.80.diff
http://ss3.gemstone.com/ss/Pharo20/NautilusCommon-EstebanLorenzano.95.diff
http://ss3.gemstone.com/ss/Pharo20/Nautilus-EstebanLorenzano.368.diff
http://ss3.gemstone.com/ss/Pharo20/Monticello-EstebanLorenzano.724.diff