Convert to MIT license, switch to included priority queue

ReadMe.1st

 SimpleKit-ruby is a minimalist Ruby library which implements discrete event
 simulation using event graphs.
 
-Copyright (C) 2012  Paul J. Sanchez
+Copyright (C) 2012-2017  Paul J. Sanchez
 
 This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
-License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
+modify it under the terms of the MIT free software license.
 
 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Lesser General Public License for more details.
-
-You should have received a copy of the GNU Lesser General Public
-License in the file lgpl.txt along with this library; if not, write
-to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
-Boston, MA  02111-1307  USA
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
 DESCRIPTION
 
@@ -30,9 +22,7 @@ recommend Lee Schruben's SIGMA package or Arnie Buss's SimKit.
 WHAT'S WHAT
 
 This top level folder contains this file, "ReadMe.1st", the
-simplekit.gemspec used to create the gem installation, and a copy of the
-GNU Lesser General Public License (LGPL) in the file "lgpl.txt".  Please
-read the LGPL to see what your rights and restrictions are!
+simplekit.gemspec used to create the gem installation.
 
 To install SimpleKit-ruby, use Ruby's "gem" command:
 

simplekit.gemspec

 # -*- ruby -*-
-_VERSION = "0.4.3"
+_VERSION = "0.4.5"
 
 Gem::Specification.new do |s|
   s.name = "simplekit"
   s.version = _VERSION
-  s.date = "2015-05-04"
+  s.date = "2017-12-01"
   s.summary = "Discrete event simulation engine."
-  s.homepage = "git://or.nps.edu/simplekit-ruby.git"
+  s.homepage = "https://gitlab.nps.edu/pjsanche/simplekit-ruby.git"
   s.email = "pjs@alum.mit.edu"
   s.description = "This is a minimal discrete event simulation scheduling algorithm for educational use."
   s.author = "Paul J Sanchez"
   s.files = %w[
     simplekit.gemspec
-    ReadMe.1st
-    lgpl.txt
     lib/simplekit.rb
+    lib/priority_queue.rb
   ]
-  s.add_runtime_dependency 'skewheap', '~> 1.0.0'
   s.required_ruby_version = '>= 1.8.1'
-  s.license = 'LGPL'
+  s.license = 'MIT'
 end