Making it not crash on Windows

Signed-off-by: John Howard <jhoward@microsoft.com>

supervisor/machine_linux.go

@@ -0,0 +1,18 @@
+package supervisor
+
+import "github.com/cloudfoundry/gosigar"
+
+func CollectMachineInformation() (Machine, error) {
+	m := Machine{}
+	cpu := sigar.CpuList{}
+	if err := cpu.Get(); err != nil {
+		return m, err
+	}
+	m.Cpus = len(cpu.List)
+	mem := sigar.Mem{}
+	if err := mem.Get(); err != nil {
+		return m, err
+	}
+	m.Memory = int64(mem.Total / 1024 / 1024)
+	return m, nil
+}