WELD-1755 Replace com.google.common.collect.Collections2

- maven-checkstyle-plugin set failsOnError=false (no full JDK8 support
yet)
WELD-1755 Replace com.google.common.collect.Iterables and Iterators
WELD-1755 Replace com.google.common.collect.Lists and Sets
WELD-1755 Replace com.google.common.collect.ForwardingList
WELD-1755 Minor javadoc updates
Replace WeldCollections.addAll() with java.util.Collections.addAll()