Write .meteor-portable-2.json files synchronously.
Write .meteor-portable-2.json files synchronously.

Previously these files were written asynchronously in an attempt to
improve performance, since the success of the write is not critical.
While I stand by my claim that it's acceptable for these writes to fail, I
noticed recently that the async write was failing very often (resulting in
an empty .meteor-portable-2.json file). Switching to sync semantics
eliminated that problem with no noticeable loss of performance. In fact,
overall performance is likely better because of the future work saved by a
successful write.

Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor