References to Class method works incorrectly

Hi,

I have in code the following lines (few of `Panel` classes implements `TagAware` interface):

```Java

private final Map<PanelType, Panel<T>> panels;

//...

panels

.values()

.stream()

.filter(TagAware.class::isInstance)

.map(TagAware.class::cast)

.forEach(t -> t.setTagsWorkHours(this.tagsWorkHours));

```

The code perfectly compile by javac, but not with GWT compiler: 

      Errors in 'file:/C:/Development/work/repo/JRS/open/gxt/calendar/widget/src/main/java/org/jresearch/gwt/client/date/widget/Calendar.java'

         Line 376: The type Class<TagAware> does not define isInstance(Panel<T>) that is applicable here

         Line 376: The method filter(Predicate<? super Panel<T>>) in the type Stream<Panel<T>> is not applicable for the arguments (TagAware.class::isInstance)

The same with cast

      Errors in 'file:/C:/Development/work/repo/JRS/open/gxt/calendar/widget/src/main/java/org/jresearch/gwt/client/date/widget/Calendar.java'

         Line 377: The method map(Function<? super Panel<T>,? extends R>) in the type Stream<Panel<T>> is not applicable for the arguments (TagAware.class::cast)

         Line 377: The type Class<TagAware> does not define cast(Panel<T>) that is applicable here

##### Known workarounds

Rewrite the above lines without method references:

```Java

panels

.values()

.stream()

.filter(p -> p instanceof TagAware)

.map(p -> (TagAware) p)

.forEach(t -> t.setTagsWorkHours(this.tagsWorkHours));

```

Best,

Stas

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