Update pebble.js and simply.js.
Merge branch 'master' of github.com:pebble/cloudpebble
Revert "Hit S3 concurrently when building for extra speed."

This reverts commit 4f89a2982cfc70614c347c100891383becc4e841 until
some intermittent issues it apparently caused can be investigated.
Fix blank red bar on import error.