.gitconfig: Add `dm` alias

`git dm` deletes local branches that have been merged with master.

Closes #309.
init: Tweak Sublime Text settings
.osx: Add Activity Monitor settings
.osx: Add Finder ‘Get Info’ settings
.osx: Display Bluetooth icon in menu bar
README: Credit @kevinSuttle
.osx: Set Desktop as the default location for new Finder windows

Closes #285.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  .osx: Set Desktop as the default location for new Finder windows
  README: Credit @kevinSuttle
  .osx: Display Bluetooth icon in menu bar
  .osx: Add Finder ‘Get Info’ settings
  .osx: Add Activity Monitor settings
  init: Tweak Sublime Text settings
  .gitconfig: Add `dm` alias

Conflicts:
	init/Preferences.sublime-settings