Updated CKEditor to 4.4.5, full version

This is primarily to remedy the Safari 7.1+ enter bug as noted here: http://dev.ckeditor.com/ticket/12423

Process:
- Downloaded the 4.4.5 full source from ckeditor.com
- Moved the new assets to respective directory omitting: styles.js, build-config.js, contents.css, samples
- Updated editor version in `lib/ckeditor/version.rb`
- Ran tests, confirmed no errors
- Tested integration with personal project, no issues