Switch from the test-construct gem (deprecated) to test_construct

Gemfile

@@ -14,7 +14,7 @@ group :development do
   gem "jeweler", ">= 1.6.2"
   gem "rcov", :platforms => :mri_18
   gem "simplecov", :platforms => :mri_19
-  gem "test-construct"
+  gem "test_construct"
   gem "capture-output", "~> 1.0.0"
   if RUBY_VERSION >= '1.9.2'
     gem "rubocop"

spec/spec_helper.rb

@@ -3,11 +3,11 @@ $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
 require 'homesick'
 require 'rspec'
 require 'rspec/autorun'
-require 'construct'
+require 'test_construct'
 require 'tempfile'
 
 RSpec.configure do |config|
-  config.include Construct::Helpers
+  config.include TestConstruct::Helpers
 
   config.before { ENV['HOME'] = home.to_s }