Shuffle Inverted Operators

Shuffling multiple inverted operators in a single message chain ☞ shuffle , shuffle-ikc

This branches fix a bug on ioke when multiple inverted operators are present on a single message chain;

foo :: bar :: baz

is shuffled into

baz ::(bar ::(foo))

The IKJ branch is fully functional, with all specs passing.
The IKC branch is a port from the java branch to F#, however specs are still failing. (please halp)