Fix s3.get(path, { file : somePath }) not closing file on error

[faridnsh]

Closes #85

I used called variable here, because when calling destroy, it will end up calling end event of file, which will call the call the callback again without error, but that's not what we want.

I have tested this with node v0.8.25 and v0.10.13, and it passes the s3-get tests(as I mentioned, some tests fail without modifications on my system, aside those no failing tests).

[SaltwaterC]

Hi. Sorry for replying so late. I was away from keyboard (in a place with poor to no Internet access). I'm going to merge this, but the "next" branch is the place where all the fun happens. I'm going to add a test there to see if the bug is present, but in the end, the next branch is almost a complete rewrite of the library.