Merge pull request #1 from vokiel/master

Not working on WordPress 4.0
Added CKEditor 4.4.4
Added ACF configuration in Advanced settings. Small visual fixes and cleanup.
Update readme.txt
Merge pull request #2 from Sebstefanov/master

Update readme.txt
Update README.md
Final commit for the 4.4.4 release.
Update readme.txt
Fix Preview/Publish JavaScript errors in Wordpress 4.x