awaitTermination interruption test
point to TestsForExecutors class from readme
doc, generics improvement (in the manifestly non-type-safe bit), remove
spurious interrupt
more complete invokeall tests, in particular showing a deviation from
the spec in Guava DirectExecutorService - on timeout of a call to
invokeAll, all subsequent tasks are still invoked.
add test suppressions for the invokeAll interruption tests that fail for
Guave
DirectExecutorService and FJP