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