Added more to the avian classpath for the collection interface as well as the list interface

Added to collection:
public boolean containsAll(Collection<?> c);
public boolean removeAll(Collection<?> c);

Added to list:
public boolean addAll(int startIndex, Collection<? extends T> c);

Also where possible for inner classes I made them extend the abstract version instead of just implement the interface.  This helps reduce code duplication where possible.

These changes were necessary to support protobuf 2.5.0

classpath/java/util/AbstractCollection.java

@@ -51,6 +51,21 @@ public abstract class AbstractCollection<T> implements Collection<T> {
     return false;
   }
 
+  public boolean containsAll(Collection<?> c) {
+    if (c == null) {
+      throw new NullPointerException("Collection is null");
+    }
+
+    Iterator<?> it = c.iterator();
+    while (it.hasNext()) {
+      if (! contains(it.next())) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
   public boolean isEmpty() {
     return size() == 0;
   }
@@ -60,6 +75,21 @@ public abstract class AbstractCollection<T> implements Collection<T> {
                                             + this.getClass().getName());
   }
 
+  public boolean removeAll(Collection<?> c) {
+    if (c == null) {
+      throw new NullPointerException("Collection is null");
+    }
+
+    boolean changed = false;
+
+    Iterator<?> it = c.iterator();
+    while (it.hasNext()) {
+      changed = remove(it.next()) || changed;
+    }
+
+    return changed;
+  }
+
   public abstract int size();
 
   public Object[] toArray() {