Improvement for サ変 of KNP

[KoichiYasuoka]

Inside _get_child_dep(c), pos for 名詞,サ変名詞 is changed into VERB when it is followed by AUX. So now I think that _get_dep(tag[0]) should be done after _get_child_dep(c).

[tamuhey]

Thanks for your contribution again!
Could you add some examples as tests that is improved by this PR?

[KoichiYasuoka]

「地震で半壊した家屋」 is added to test_dependency_parser.py and all checks have passed.

[tamuhey]

Thanks!