Fix permissions error (EPERM) on Windows

[ArtskydJ]

The dotfile was getting permissions errors on windows.

This fixes the issue by buffering in memory rather than writing to a dotfile.

Memory usage was similar in my tests. (Write to dotfile: 42k, Buffer in memory: 42-44k.)

Fixes #83.

Related: #103, #104, #156.

[ghost]

It would be good to know why this seems to fix the issue. Buffering up the contents sounds like it might be more related to a timing issue than the sequence of operations on disk.It looks like fs.watch() has problems on windows generating spurious EPERMs: nodejs/node-v0.x-archive#3250 nodejs/node-v0.x-archive#4337 Some of the issues seem to suggest the error can just be ignored or it might work to just unregister

[ghost]

What happens in windows when:

    wb.pipe(fs.createWriteStream(dotfile));

is changed to:

    wb.pipe(fs.createWriteStream(outfile));

with the fs.renae() part removed?

[ArtskydJ]

Writing straight to the outfile works great. PR here: #161

(The EPERM error was always thrown on the dotfile.)