Ubuntu: default clipboard should not be selection but real clipboard

[grosser]

Clipboard.paste().should == Clipboard.paste('clipboard') so it behaves consistent on all platforms

[janlelis]

Hm, the primary clipboard seems to be the default one in xclip. I can change that, but I need to understand more why.

Btw, the whole "three clipboards thing" in X is very annoying °_°.

[grosser]

xclip thinks selection should be default afaik, but every other person thinks that the 'primary' clipboard is not the selection

[janlelis]

changed with your commit.