Create rspec test structure for build tests

.rspec

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+--color
+--require spec_helper

Rakefile

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 require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task :default => :spec

build_tests/c-simple/spec.rb

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+it 'builds a C program with one source file' do
+end

spec/build_tests_spec.rb

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+require 'fileutils'
+
+describe Rscons do
+  FileUtils.rm_rf('build_tests/test')
+  test_dirs = Dir['build_tests/*/']
+  test_dirs.each do |build_test_rel_path|
+    FileUtils.cp_r(build_test_rel_path, 'build_tests/test')
+    Dir.chdir('build_tests/test') do
+      instance_eval(File.read('spec.rb'))
+    end
+    FileUtils.rm_rf('build_tests/test')
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1 @@
+require "rscons"