Added BlockChain.info balance check

I added a balance check for btc addresses at blockchain.info.  I also added a link to W3Schools color map in the index.htm.

At this present time I didn't add colors to the balance check.  But this easily if needed.

Check a balance like this: http://fizzisist.com/priceimg/img/1Q2QDC78uaGgkm4r3G5YzZSriPv7KMUuQU

Thanks,
[mad]Berry