Fix build script.

- Change shell path and file mode
- go get md2min instead of blackfriday

ebook/build.sh

@@ -1,10 +1,11 @@
-#!/usr/bin/sh
+#!/bin/sh
 
 rm -f *.html *~
 
 export GOPATH=`pwd`
 
-go get -u github.com/russross/blackfriday
+#go get -u github.com/russross/blackfriday
+go get -u github.com/fairlyblank/md2min
 
 go run build.go