Support for hashref in AUTOLOADed methods i.e

$z->repeat_content({
  div => ['foo'],
  span => ['bar'],
})
additional test
also work in streambase
add DESTROY methods to fix 5.14 noticing them being missing.
test for hashref support on codestream
some simple shorthand helpers.

add_class
remove_class
set_class
set_id
support for hashref in set_attribute + add_to_attribute
another test
update docs.
update docs
merge helpers
merge helpers
add remove_from_attribute to make remove_class actually do what it's supposed to.
ignore if attr doesn't exist.
improvement
merge
merge
dev version