Fix 'remove' typo.
Merge pull request #123 from TrevorS/patch-1

Fix 'remove' typo.
Specify a hard dependency on Emacs 24.3
Bump error message to the required version 24.3+ of emacs
Merge pull request #128 from mathias/mathias-emacs-version-error-bump

Bump error message to the required version 24.3+ of emacs