Fix gemspec's warnings

Fix copyright years

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2011 Jonathan Leighton
+Copyright (c) 2011-2013 Jonathan Leighton
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

poltergeist.gemspec

@@ -1,25 +1,27 @@
-# -*- encoding: utf-8 -*-
 lib = File.expand_path('../lib/', __FILE__)
 $:.unshift lib unless $:.include?(lib)
 
 require 'capybara/poltergeist/version'
 
 Gem::Specification.new do |s|
-  s.name        = "poltergeist"
+  s.name        = 'poltergeist'
   s.version     = Capybara::Poltergeist::VERSION
   s.platform    = Gem::Platform::RUBY
-  s.authors     = ["Jon Leighton"]
-  s.email       = ["j@jonathanleighton.com"]
-  s.homepage    = "http://github.com/jonleighton/poltergeist"
-  s.summary     = "PhantomJS driver for Capybara"
-  s.description = "PhantomJS driver for Capybara"
+  s.authors     = ['Jon Leighton']
+  s.email       = ['j@jonathanleighton.com']
+  s.homepage    = 'http://github.com/jonleighton/poltergeist'
+  s.summary     = 'PhantomJS driver for Capybara'
+  s.description = 'Poltergeist is a driver for Capybara that allows you to '\
+                  'run your tests on a headless WebKit browser, provided by '\
+                  'PhantomJS.'
+  s.license     = 'MIT'
 
-  s.required_ruby_version = ">= 1.9.2"
+  s.required_ruby_version = '>= 1.9.2'
 
-  s.add_dependency "capybara",         "~> 2.1.0"
-  s.add_dependency "websocket-driver", ">= 0.2.0"
-  s.add_dependency "multi_json",       "~> 1.0"
-  s.add_dependency "cliver",           "~> 0.2.1"
+  s.add_dependency 'capybara',         '~> 2.1.0'
+  s.add_dependency 'websocket-driver', '>= 0.2.0'
+  s.add_dependency 'multi_json',       '~> 1.0'
+  s.add_dependency 'cliver',           '~> 0.2.1'
 
   s.add_development_dependency 'rspec',              '~> 2.12'
   s.add_development_dependency 'sinatra',            '~> 1.0'
@@ -30,6 +32,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'guard-coffeescript', '~> 1.0.0'
   s.add_development_dependency 'rspec-rerun',        '~> 0.1'
 
-  s.files        = Dir.glob("{lib}/**/*") + %w(LICENSE README.md)
+  s.files        = Dir.glob('{lib}/**/*') + %w(LICENSE README.md)
   s.require_path = 'lib'
 end