Reorganize main package structure per discussion

cmd/chihaya/main.go

@@ -0,0 +1,13 @@
+// Copyright 2014 The Chihaya Authors. All rights reserved.
+// Use of this source code is governed by the BSD 2-Clause license,
+// which can be found in the LICENSE file.
+
+package main
+
+import (
+	"github.com/chihaya/chihaya"
+)
+
+func main() {
+	chihaya.Boot()
+}