update start.[sh|bat] to work with latest Amber (as suggested by @philippeback)

fixes #14

start.bat

@@ -1 +1 @@
-node vendor/amber/server/server.js %*
+node vendor/amber/cli/js/amber-cli.js serve %*

start.sh

@@ -1,3 +1,3 @@
 #! /bin/sh
 
-node vendor/amber/server/server.js $@
+node vendor/amber/cli/js/amber-cli.js serve $@