2.3404: fix interop with JSON::XS booleans

the internal boolean objects are now blessed into JSON::XS::Boolean
Fixes issue #13 and [cpan #92548] (samuel.c.kaufman)

t/96_interop.t: added
LICENSE section to pod added for t/z_kwalitee.t
README: fixed some pod spelling errors in (David Steinbrunner)