Feature: include other Ocean data

[fischcheng]

Great work you've done. It's a very gorgeous site, which I immediately forwarded to all the members in my group. I understand that the major focus is on the Weather condition, instead of the ocean. As a oceanography student, I have two points to make. First, beside SST and surface currents, Sea Surface Height and Chlorophyll(ocean color) are also of great interest, it would be nice to include some from AVISO project. Second, the ocean current data is updated every five days using OSCAR data. It would be a good idea to try NOAA/RTOFS (real time ocean forecast system, http://polar.ncep.noaa.gov/global/). I've used their data to generate some daily plots when I went on a cruise last year.

Since the source code is open-sourced, I will give it a try to include these few data sets I mentioned above. Thanks again for the great work!