Specify Emacs 24.3 dependency

Make the 24.3 dependency explicit as this affects Debian/Ubuntu/Mint users, since official emacs24 is at 24.1.1.
Merge pull request #134 from pandeiro/master

Specify Emacs 24.3 dependency
Update built-in.el

Preserve whitespace in markdown mode
Merge pull request #140 from solussd/patch-5

Update built-in.el
Merge remote-tracking branch 'origin/master' into jw
adding cider