Meteor 1.4.3.x update

Update to Meteor 1.4.3.x 

Currently blocked by https://github.com/meteor/meteor/issues/8427

```

SyntaxError: Unexpected end of input
    at Object.parse (native)
    at /tools/fs/optimistic.js:204:17
    at wrap.makeCacheKey._len2 (/tools/fs/optimistic.js:22:15)
    at Entry._reallyRecompute (/Users/a
```