Run script/bootstrap immediately after running script/build

This will ensure all the dependencies used later in `script/build` are
installed.

script/build

@@ -2,6 +2,10 @@
 
 'use strict'
 
+// Run bootstrap first to ensure all the dependencies used later in this script
+// are installed.
+require('./bootstrap')
+
 // Needed so we can require src/module-cache.coffee during generateModuleCache
 require('coffee-script/register')
 require('colors')
@@ -42,8 +46,6 @@ process.on('unhandledRejection', function (e) {
   process.exit(1)
 })
 
-require('./bootstrap')
-
 cleanOutputDirectory()
 copyAssets()
 transpileBabelPaths()