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Add        images/760px-Federation_4.png

Signed-off-by: Shen Jian <shenjian74@gmail.com>
Deleted    _posts/2013-12-1-bitcoin-to-ripple-2.md
Add        _posts/2013-12-3-bitcoin-to-ripple-2.md

Signed-off-by: Shen Jian <shenjian74@gmail.com>