FIX: `coffee-mode` uses `coffee-tab-width` instead of `tab-width`.

And recently it has removed `tab-width` dependency completely.
Merge pull request #493 from pokehanai/hotfix/coffee-tabwidth

FIX: `coffee-mode` uses `coffee-tab-width` instead of `tab-width`.
Don't mess with Projectile's modeline text
Merge branch 'master' of github.com:bbatsov/prelude
Attempt to refactor two "duplicate" functions.

Attempt to extract a generic function `prelude-get-positions-of-line-or-region` from `prelude-duplicate-current-line-or-region` and `prelude-duplicate-and-comment-current-line-or-region`
Merge pull request #499 from bixuanzju/patch-1

Attempt to refactor two "duplicate" functions.
don't enable coffee-cos mode if buffer filename is nil
Merge pull request #501 from wishbear/master

don't enable coffee-cos mode if buffer filename is nil
Merge branch 'master' of https://github.com/bbatsov/prelude