first crack at array->defined/exists

https://rt.cpan.org/Public/Bug/Display.html?id=96788

	modified:   lib/List/Objects/WithUtils/Role/Array.pm
	new file:   t/01_array/defined.t
	new file:   t/01_array/exists.t
test tweak

	modified:   t/01_array/exists.t
test order tweak

	modified:   t/01_array/exists.t
test tweaks, style cleanups

	modified:   lib/List/Objects/WithUtils/Role/Array.pm
	modified:   t/01_array/defined.t
	modified:   t/01_array/exists.t
POD / comment tweaks

	modified:   lib/List/Objects/WithUtils.pm
	modified:   lib/List/Objects/WithUtils/Role/Array.pm
Merge branch 'array-exists'

* array-exists:
  POD / comment tweaks
  test tweaks, style cleanups
  test order tweak
  test tweak
  first crack at array->defined/exists