Please review the change to access the annotations from module-info

[Mandy Chung]

Joe,

Thanks for the feedback to the ModuleInfo API.  This change also 
implements the reflection methods to access the annotations in the 
java.lang.reflect.Module class (i.e. implementation of AnnotatedElement 
methods).

The webrev is at:
   http://cr.openjdk.java.net/~mchung/jigsaw/annotations/webrev/

Most of the work is done in the java.lang.module.ModuleInfoAnnotation 
class that does the following:
- parses a raw annotation from the module-info.class
- stores the element value pairs
- creates an Annotation object using the core reflection
- it supports for both ModuleInfo and Module API to access annotations.  
The Annotation objects created for the ModuleInfo.getAnnotation() method 
doesn't support elements of Class type.

I added a constructor of CoreReflectionFactory to take a Module 
parameter so that its module class loader will be used to load classes 
when instantiating an Annotation object.   Is there any issue with 
that?  The factory will only be used to parse class signatures.

Thanks
Mandy