corrected 9 broken cross-references in documentation
WELD-1756 Replace Guava - caches

- we are not able to replace the ClassTransformer.enhancedAnnotatedTypes due to recursion computation problems
- LoadingCacheUtils should be deleted afterwards
WELD-1756 Don't catch guava ExecutionError, code cleanup, javadoc update
WELD-1756 Revert one replacement in SpecializationAndEnablementRegistry

- recursion computation problems
WELD-1756 Update ComputingCache javadoc - recursive computations are not
supported
WELD-1495 Support loading Service implementations using ServiceLoader
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