[MERGE] binary/text mode test failures on windows

[John Arbash Meinel]

John Arbash Meinel has voted tweak.
Status is now: Conditionally approved
Comment:
We shouldn't really be doing a bare "open(foo).write()" as that can 
cause race conditions/poor exception handling.

I'll fix that up when I merge.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C021201c90ff8%24df217e30%249d647a90%24%40com.au%3E
Project: Bazaar