Show new benchmark.bash in README

The old benchmark is in benchmark-builtin.bash.

renamed:    benchmarks-builtin.bash -> benchmark-builtin.bash
renamed:    benchmarks-external.bash -> benchmark.bash

README.md

@@ -82,17 +82,15 @@ Run `./benchmark.bash` to run the benchmarks.
 
 The output should look like this:
 
-	./benchmark.bash
+```
-	gocryptfs v0.3.1-30-gd69e0df-dirty; on-disk format 2
+$ ./benchmark.bash
-	PASS
+linux-3.0.tar.gz       100%[===========================>]  92,20M  2,96MB/s    in 35s
-	BenchmarkStreamWrite-2	     100	  12246070 ns/op	  85.63 MB/s
+2016-01-23 20:08:11 URL:https://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.gz [...]
-	BenchmarkStreamRead-2 	     200	   9125990 ns/op	 114.90 MB/s
+WRITE: 131072000 bytes (131 MB) copied, 1,36225 s, 96,2 MB/s
-	BenchmarkCreate0B-2   	   10000	    101284 ns/op
+UNTAR: 23.16
-	BenchmarkCreate1B-2   	   10000	    178356 ns/op	   0.01 MB/s
+LS:    1.71
-	BenchmarkCreate100B-2 	    5000	    361014 ns/op	   0.28 MB/s
+RM:    4.36
-	BenchmarkCreate4kB-2  	    5000	    375035 ns/op	  10.92 MB/s
+```
-	BenchmarkCreate10kB-2 	    3000	    491071 ns/op	  20.85 MB/s
-	ok  	github.com/rfjakob/gocryptfs/integration_tests	17.216s
 
 Changelog
 ---------

benchmark-builtin.bash

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Run the synthetic benchmarks that are built into gocryptfs using
+# "go test".
+
 set -eu
 
 source build.bash

benchmark.bash

@@ -1,18 +1,20 @@
 #!/bin/bash
 
+# Run the set of "canonical" benchmarks that are shown on
+# https://nuetzlich.net/gocryptfs/comparison/
+
 set -eu
 
 TIME="/usr/bin/time -f %e"
 
 # Setup
 cd /tmp
-wget -q -c https://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.gz
+wget -nv --show-progress -c https://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.gz
 DIR1=$(mktemp -d)
 DIR2=$(mktemp -d)
 gocryptfs -q -init -extpass="echo test" $DIR1
 gocryptfs -q -extpass="echo test" $DIR1 $DIR2
 cd $DIR2
-echo
 
 # Benchmarks
 echo -n "WRITE: "