Add ^^/ shortcut to top-level build directory - close #146

build_tests/typical/carat.rb

@@ -1,9 +1,10 @@
 build do
   Environment.new(echo: :command) do |env|
-    env.append('CPPPATH' => glob('src/**').sort)
+    env.append("CPPPATH" => glob("src/**"))
     FileUtils.mkdir_p(env.build_root)
     FileUtils.mv("src/one/one.c", env.build_root)
+    FileUtils.mv("src/two/two.c", Rscons.application.build_dir)
     env.Object("^/one.o", "^/one.c")
-    env.Program("program.exe", glob('src/**/*.c') + ["^/one.o"])
+    env.Program("^^/program.exe", ["^/one.o", "^^/two.c"])
   end
 end