Add spidermonkey component

component/spidermonkey/buildout.cfg

+[buildout]
+
+[spidermonkey-1.7]
+recipe = slapos.recipe.build
+url = ftp://ftp.mozilla.org/pub/mozilla.org/js/js-1.7.0.tar.gz
+md5sum = 5571134c3863686b623ebe4e6b1f6fe6
+slapos_promise =
+  directory:include/
+  directory:bin/
+  file:bin/js
+  statlib:lib/libjs.a
+  file:lib/libjs.so
+script =
+  url = self.download(self.options['url'], self.options['md5sum'])
+  extract_dir = self.extract(url)
+  workdir = os.path.join(guessworkdir(extract_dir), 'src')
+  env.update(JS_DIST=self.options['location'])
+  call(['make', '-f', 'Makefile.ref'], cwd=workdir, env=env)
+  call(['make', '-f', 'Makefile.ref', 'export'], cwd=workdir, env=env)