Minor name changes.
Update edit button to alert when clicking with no post selected.
Dropped $default argument for localize_page/post_permalink
Added default None option for language.
Reworked get_post_lang and set_post_lang, cache usage tweaks.
Update get_post_lang alias.
Merge branch 'master' of github.com:dougwollison/nLingual
Added entry for no post selected.