Full restructure in accordance with

- pkg/{subsystem}/{package} style
  - modify Makefile to reflect the new style,
    consolidate various entries
  - add a dummy ``main.go`` at top level

pkg/utils/cpu/cpu_test.go

@@ -0,0 +1,80 @@
+/*
+ * Mini Object Storage, (C) 2014 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// +build amd64
+
+package cpu
+
+import (
+	"errors"
+	"os/exec"
+	"runtime"
+	"strings"
+	"testing"
+
+	. "gopkg.in/check.v1"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func hasCpuFeatureFromOS(feature string) (bool, error) {
+	if runtime.GOOS == "linux" {
+		command := exec.Command("/bin/cat", "/proc/cpuinfo")
+		output, err := command.Output()
+		if err != nil {
+			return false, err
+		}
+		if strings.Contains(string(output), feature) {
+			return true, nil
+		} else {
+			return false, nil
+		}
+	} else {
+		// TODO find new way to test cpu flags on windows
+		return false, errors.New("Not Implemented on this platform")
+	}
+}
+
+func (s *MySuite) TestHasSSE41(c *C) {
+	if runtime.GOOS == "linux" {
+		var flag = HasSSE41()
+		osCheck, err := hasCpuFeatureFromOS("sse4_1")
+		c.Assert(err, IsNil)
+		c.Check(flag, Equals, osCheck)
+	}
+}
+
+func (s *MySuite) TestHasAVX(c *C) {
+	if runtime.GOOS == "linux" {
+		var flag = HasAVX()
+		osFlag, err := hasCpuFeatureFromOS("avx")
+		c.Assert(err, IsNil)
+		c.Check(osFlag, Equals, flag)
+	}
+}
+
+func (s *MySuite) TestHasAVX2(c *C) {
+	if runtime.GOOS == "linux" {
+		var flag = HasAVX2()
+		osFlag, err := hasCpuFeatureFromOS("avx2")
+		c.Assert(err, IsNil)
+		c.Check(osFlag, Equals, flag)
+	}
+}