Added Zissou2 colors, updated documentation, and README

Karthik,

LOVE this package, but I really liked the Life Aquatic palette on the tumblr blog, so I added that in as Zissou2.  

I updated the documentation to include this, updated the README, and the weanderson help appeared to be an older .Rd and link to the tumblr was busted.  I fixed that as well.

I've tested my changes and don't think I broke anything...

Cheers,
Jeff