Java 9 support for "Full Profile"

[keilw]

Loosely following patterns by JSR 374 (https://github.com/json-p/api-ri/blob/master/api/src/main/jdk9/module-info.java and profiles in https://github.com/json-p/api-ri/blob/master/pom.xml) we should add a module (based on JSR 374 it would be "java.measure") and module-info for Java 9 builds.
Effectively releasing such build or any additional Java 9/Jigsaw support will require a MR1 of JSR 363.

[keilw]

JEP http://openjdk.java.net/jeps/200 states that:

1. Standard modules, whose specifications are governed by the JCP, must have names starting with the string "java.".

So the module name should be java.measure for the Full JSR 363 module.

[desruisseaux]

Added a pull request for partial support (not yet fully working because of changes needed in maven-compiler-plugin and other Maven plugins): #51