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
Merge branch 'master' of github.com:purcell/emacs.d
Merge branch 'master' of github.com:JamesYuan/emacs.d
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