Merge pull request #1470 from skiman6010/patch-4

Add tldr package.

packages/tldr.rb

+require 'package'
+  
+class Tldr < Package
+  description 'A collection of simplified and community-driven man pages.'
+  homepage 'http://tldr.sh/'
+  version '93cfb27'
+  source_url 'https://github.com/raylee/tldr/archive/93cfb278d2c56c3518a39ba3e01cbfc40423cc3b.tar.gz'
+  source_sha256 'd565c6bdc594b87bf204fa35b3059011931a3cb59b935812c8a8a5fbe1fbd5e5'
+
+  def self.install
+    system "install -Dm755 tldr #{CREW_DEST_PREFIX}/bin/tldr"
+  end
+end