Revert "Remove dangling reference to desktop-save-mode"

This reverts commit 72843466db51db0d49429663563bb99f39700b0d.
Require git-rebase-mode
Disable bug-reference-github pending upstream changes

https://github.com/arnested/bug-reference-github/issues/1

Fixes https://github.com/purcell/emacs.d/issues/122
Use css-eldoc
Re-enable bug-reference-github following upstream merge
Only use ido-ubiquitous in Emacs 24, which it now requires
Don't use ido-ubiquitous-disable-in, which has been removed upstream

Fixes #127
Clarify installation instructions (see #129)
Require new separate magit-svn package
Better handle maximize-frame when frames are full-screen
org-mac-link-grabber has been renamed to org-mac-link (fixes #131)
Add cl-lib-highlight
Drop clojure slime support, and make slime work with common lisp

See #56, #57, #70

If upgrading, first remove ~/.emacs.d/elpa/slime-fuzzy* and
~/.emacs.d/elpa/slime-repl*, then restart Emacs.
Require installation of my new whitespace-cleanup-mode
Automatically remove .elc files for any slime contrib libs (see #56)
Enable whitespace-cleanup-mode in this repository
Enable page-break-lines-mode in haskell buffers
Make some corrections to README
Enable global-whitespace-cleanup-mode
Revert "Enable whitespace-cleanup-mode in this repository"

This reverts commit 64494271dc1e507f25abb786dea9a59562abf062.