Enable Class<>::Find() for Array objects

[kkaefer]

Class<>::Find currently calls the tag's Name() method, which means that it's currently quite ugly to retrieve an array class (e.g. Object[]) since you'd have to specify [Ljava/util/Object; as the Name() of the tag.

Instead, we could implement a Name() function on Array<Object<...>> specialization, so you could do jni::Class<jni::Array<jni::Object<...>>>::Find(env).

[jfirebaugh]

There's a lack of parallelism here which concerns me:

• The class of Object<ObjectTag> is Class<ObjectTag>
• But the class of Array<ObjectTag> is Class<Array<ObjectTag>>

In one case the Class template parameter is a tag object, in the other it's Array<>, which is in a different type category.

One alternative is Class<ArrayTag<ObjectTag>>, with:

template < class TagType >
struct ArrayTag
   {
    static const char * Name() { return TypeSignature<Array<Object<TagType>>>()(); }
   };

Another alternative is to define a separate ArrayClass template. This has the advantage that it could omit New (which is expressly prohibited for array classes) and GetConstructor. Not sure about all of the remaining methods. Array classes inherit from Object , so GetMethod is definitely relevant, but I'm not sure about anything else.

[jfirebaugh]

This was addressed as part of #40, via addition of ArrayTag<T>, which was needed for other reasons. So you can now do jni::Class<jni::ArrayTag<jni::Object<>>>::Singleton(env) or jni::Class<jni::ArrayTag<jni::jlong>>::Singleton(env).