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fs-write-stream-atomic

Like `fs.createWriteStream(...)`, but atomic.

Writes to a tmp file and does an atomic `fs.rename` to move it into place when it's done.

First rule of debugging: It's always a race condition.

# USAGE

var fsWriteStreamAtomic = require('fs-write-stream-atomic')
// options are optional.
var write = fsWriteStreamAtomic('output.txt', options)
var read = fs.createReadStream('input.txt')
read.pipe(write)
// When the write stream emits a 'finish' or 'close' event,
// you can be sure that it is moved into place, and contains
// all the bytes that were written to it, even if something else
// was writing to `output.txt` at the same time.

## <tt>fsWriteStreamAtomic(filename, [options])</tt>

- `filename` {String} The file we want to write to
- `options` {Object}
  - `chown` {Object} User and group to set ownership after write
    - `uid` {Number}
    - `gid` {Number}
  - `encoding` {String} default = 'utf8'
  - `mode` {Number} default = `0666`
  - `flags` {String} default = ‘'w’`