add initial related_class(), related_classes() sugar

...that was way easier than I thought it was going to be.
add POD for related_class(), related_classes()
Restructure our synopsis
add EXAMPLES section

...mainly from the (once and still) overly-large SYNOPSIS section.
little doc update
travis: stop running author and release tests

...this may be reconsidered.
nit! make Pod::Spelling happy
=sugar => =func

I still need to think about that one.