Allow zero backups

[gabrielbrieva]

It is possible to allow zero backups files?

[lamweili]

I tried the following and it didn't work.

var rollers = require('streamroller');
var stream = new rollers.RollingFileStream('myfile', 3, 0);
stream.write("abc");
stream.write("def");
stream.write("ghi");
stream.end();

Output:

myfile   - ghi
myfile.1 - def

[lamweili]

I tried the following and it now works.

Important
It is also to note the file does not roll within itself (truncate its older entry for newer entry).
It truncates all and appends only the new entry.

var rollers = require('streamroller');
var stream = new rollers.RollingFileStream('myfile', 6, 0);
stream.write("abc"); // add as first row
stream.write("def"); // add as second row
stream.write("ghi"); // truncate all and add as first row
stream.end();

Output:

myfile   - ghi

[lamweili]

For details, refer to #74 (comment)