Improve rendering time

50% speedup.  Fix #91

to run the benchmark:

		go test -test.run=NONE -bench=".*" -test.benchmem=true ./transform/ > new.txt

to compare the results:

		/usr/local/go/misc/benchcmp baseline.txt new.txt

Speedup and memory improvements

		benchmark             old ns/op    new ns/op    delta
		BenchmarkChain           101219        50453  -50.15%
		BenchmarkTransform        51625        45531  -11.80%

		benchmark            old allocs   new allocs    delta
		BenchmarkChain              222          103  -53.60%
		BenchmarkTransform          135          106  -21.48%

		benchmark             old bytes    new bytes    delta
		BenchmarkChain            23919        10998  -54.02%
		BenchmarkTransform        11858        10665  -10.06%

1 files changed, 10 insertions, 9 deletions

diff --git a/transform/chain_test.go b/transform/chain_test.go
index b479ac1e3..594b5a5d4 100644
--- a/transform/chain_test.go
+++ b/transform/chain_test.go
@@ -15,7 +15,8 @@ func TestChainZeroTransformers(t *testing.T) {
 }
 
 func TestChainOneTransformer(t *testing.T) {
-	tr := NewChain(&AbsURL{BaseURL: "http://base"})
+	absURL, _ := AbsURL("http://base")
+	tr := NewChain(absURL...)
 	apply(t.Errorf, tr, abs_url_tests)
 }
 
@@ -28,19 +29,19 @@ var two_chain_tests = []test{
 }
 
 func TestChainTwoTransformer(t *testing.T) {
-	tr := NewChain(
-		&AbsURL{BaseURL: "http://two"},
-		&NavActive{Section: "section_1"},
-	)
+	absURL, _ := AbsURL("http://two")
+	nav := NavActive("section_1", "hugo-nav")
+	tr := NewChain(append(absURL, nav...)...)
 	apply(t.Errorf, tr, two_chain_tests)
 }
 
 func BenchmarkChain(b *testing.B) {
 
-	tr := NewChain(
-		&AbsURL{BaseURL: "http://two"},
-		&NavActive{Section: "section_1"},
-	)
+	absURL, _ := AbsURL("http://two")
+	nav := NavActive("section_1", "hugo-nav")
+	tr := NewChain(append(absURL, nav...)...)
+
+	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		apply(b.Errorf, tr, two_chain_tests)
 	}