Updating jdk8 README files

[Kelly O'Hair]

FYI...

I am in the process of updating the OpenJDK8 build readme files. I'm working in the build-infra/jdk8
forest with these files and will update the jdk8/build forest when they near completion.
In the meantime, anyone wishing to view the current state can view them through the build-infra/jdk8 forest.

I am pretty much done with this one:
   http://hg.openjdk.java.net/build-infra/jdk8/raw-file/tip/README

But still working on README-builds.html, moving a great deal of the information to Appendix's, which still
need to be organized, merged, deleted, cleaned up, etc.
   http://hg.openjdk.java.net/build-infra/jdk8/raw-file/tip/README-builds.html

Please send me any comments or observations.

-kto