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
Merge branch 'master' of https://github.com/ReadyTalk/avian
Merge pull request #55 from jentfoo/master

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