switch to gulp for build process

scripts/build.sh

@@ -1,10 +0,0 @@
-#!/bin/sh
-set -e
-
-for f in packages/*; do
-  if [ -d "$f/src" ]; then
-    node node_modules/babel/bin/babel "$f/src" --out-dir "$f/lib" --copy-files $1 &
-  fi
-done
-
-wait