Update to JEP 261: Module System

I've updated JEP 261 (http://openjdk.java.net/jeps/261). Major changes include: - The special ALL-DEFAULT module name, which represents the default set of root modules for use with the -addmods option [1]; - A more thorough explanation of how the built-in class loaders have changed,

JEP 261: Module System

New JEP Candidate: http://openjdk.java.net/jeps/261 - Mark