Adding benchmark for parsing pages using unicode.

The resulting comparsion is not equal because NewPage reads the file each time where ReadFrom just reads a buffer in memory.

hugolib/benchmark_test.go

@@ -0,0 +1,23 @@
+package hugolib
+
+import (
+	"os"
+	"bytes"
+	"testing"
+)
+
+func BenchmarkParsePage(b *testing.B) {
+	f, _ := os.Open("redis.cn.md")
+	sample := new(bytes.Buffer)
+	sample.ReadFrom(f)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		ReadFrom(sample, "bench")	
+	}
+}
+
+func BenchmarkNewPage(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		NewPage("redis.cn.md")
+	}
+}