README.txt appears to link to wrong site

[ulmangt]

The frontpage readme: https://github.com/nasa/World-Wind-Java/blob/master/README.txt has a link to http://oneworldwind.org/

However, this page appears to contain a blog unrelated to World Wind.

[vidyuthd]

The above is also true for the android sdk link pointed out in readme (http://oneworldwind.org/android). Please change this too.