Fix #78. Better error message for script failures

lib/utils/lifecycle.js

@@ -29,13 +29,10 @@ function lifecycle (pkg, stage, cb) {
   // NOTE: The env vars won't work until node supports env hashes for child procs
   var env = makeEnv(pkg)
   env.npm_lifecycle_event = stage
+  env.npm_lifecycle_script = pkg.scripts[stage]
 
-  // support stuff like "make install" or "node test/all.js"
-  var args = pkg.scripts[stage].split(/\s/)
-    , script = args.shift()
-  exec(script, args, env, function (er, ok) {
-    cb(er, ok)
-  })
+  exec("sh", ["-c", env.npm_lifecycle_script], env, log.er(cb,
+    "Failed to exec "+stage+" script"))
 }
 
 function makeEnv (data, prefix, env) {