Merge branch 'master' into d

switch from waf to rscons

Rsconscript

@@ -0,0 +1,7 @@
+Rscons::Environment.new do |env|
+  env["sources"] = Dir[
+    "src/**/*.d", 
+    "src/**/*.c"]
+  env["D_IMPORT_PATH"] += Dir["src/**/"]
+  env.Program("jes", "${sources}")
+end