Add basic tests for form's named getter.
Add a test for named items outside the form to catch a Gecko bug.
Add a test that Gecko does get right.
Add tests that the form attribute is taken into account for the named getter.
Add a test for nested forms.
Add empty lines for jgraham.
Add a check that the named getter returns a NodeList in the case of multiple arguments.
Add a note about further work.
Merge pull request #111 from Ms2ger/form-named-item

Add basic tests for form's named getter.