Clean up some unused packages.
On branch master
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  (use "git reset HEAD <file>..." to unstage)

	modified:   Default (Linux).sublime-keymap
	modified:   Package Control.sublime-settings
Add Prolog.
On branch master
Your branch is ahead of 'origin/master' by 1 commit.
  (use "git push" to publish your local commits)

Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

	modified:   Package Control.sublime-settings
	modified:   Preferences.sublime-settings