Replaced Kopimi for Creative Commons Zero in Ephemeral Music and Trip Journal

Kopimi and CC0 are more or less the same so I can now have the same style of license button for all my posts. That's really the only lousy reason ;|
Good luck to Kopimi, and bye.

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Update: I removed the license button in every single post (it looked too cluttered). The two licenses I'm using are at the bottom of the blog and in the tag-cloud.