Consistently use single quotes

Gemfile

@@ -1,4 +1,4 @@
-source "http://rubygems.org"
+source 'http://rubygems.org'
 
 gemspec
 

em-http-request.gemspec

@@ -1,33 +1,33 @@
 # -*- encoding: utf-8 -*-
-$:.push File.expand_path("../lib", __FILE__)
-require "em-http/version"
+$:.push File.expand_path('../lib', __FILE__)
+require 'em-http/version'
 
 Gem::Specification.new do |s|
-  s.name        = "em-http-request"
+  s.name        = 'em-http-request'
   s.version     = EventMachine::HttpRequest::VERSION
 
   s.platform    = Gem::Platform::RUBY
   s.authors     = ["Ilya Grigorik"]
-  s.email       = ["[email protected]"]
-  s.homepage    = "http://github.com/igrigorik/em-http-request"
-  s.summary     = "EventMachine based, async HTTP Request client"
+  s.email       = ['[email protected]']
+  s.homepage    = 'http://github.com/igrigorik/em-http-request'
+  s.summary     = 'EventMachine based, async HTTP Request client'
   s.description = s.summary
-  s.rubyforge_project = "em-http-request"
+  s.rubyforge_project = 'em-http-request'
 
-  s.add_dependency "addressable", ">= 2.3.4"
-  s.add_dependency "cookiejar"
-  s.add_dependency "em-socksify", ">= 0.3"
-  s.add_dependency "eventmachine", ">= 1.0.3"
-  s.add_dependency "http_parser.rb", ">= 0.6.0.beta.2"
+  s.add_dependency 'addressable', '>= 2.3.4'
+  s.add_dependency 'cookiejar'
+  s.add_dependency 'em-socksify', '>= 0.3'
+  s.add_dependency 'eventmachine', '>= 1.0.3'
+  s.add_dependency 'http_parser.rb', '>= 0.6.0.beta.2'
 
-  s.add_development_dependency "mongrel", "~> 1.2.0.pre2"
-  s.add_development_dependency "rack"
-  s.add_development_dependency "rake"
-  s.add_development_dependency "rspec"
-  s.add_development_dependency "yajl-ruby"
+  s.add_development_dependency 'mongrel', '~> 1.2.0.pre2'
+  s.add_development_dependency 'rack'
+  s.add_development_dependency 'rake'
+  s.add_development_dependency 'rspec'
+  s.add_development_dependency 'yajl-ruby'
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
-  s.require_paths = ["lib"]
+  s.require_paths = ['lib']
 end