fixed typo in readme
Preserves custom root URLs - / - in menus, bypassing untrailingslashit calls
wrote test that fails with hashes in URL
merged with updated tests; resolved fragment in get_rel_url
Merge branch 'jnweaver-menu_root_url_fix'

* jnweaver-menu_root_url_fix:
  Preserves custom root URLs - / - in menus, bypassing untrailingslashit calls