Started 4.2.3 development.
Added http protocol for external script in jQuery adapter sample.
Changelog entry.
Merge branch 't/10994'
Check if path exists onOpen.
Changelog entry.
Merge branch 't/10975'
#9929: [Chrome 23] &nbsp; is created when deleting character and typing common space

It seems as &nbsp; is a result of altering source for checkStartOfBlock()/checkEndOfBlock(). Changing order of checks in if checkStartOfBlock()/checkEndOfBlock() are run only when necessary, not every time del/backspace is pressed.
Changelog entry.
Merge branch 't/9929'
Changed Magicline keystrokes to CTRL+SHIFT+3 and CTRL+SHIFT+4.
Changelog entry.
Merge branch 't/10963'
Update divreplace.html

Fix for https://dev.ckeditor.com/ticket/11093
Merge pull request #65 from Synchro/master

Update divreplace.html, making the CSS properties lowercased.
Check next.type before next.is( 'table' ).
Changelog entry.
Merge branch 't/11096'
CKEditor 4.2.3 changelog corrected.
jQuery Adapter link added to changelog.