Adds lexicographically sortable timestamps to objects.

The following example places timestamps on objects. The object will have a key named 'key' and its value will be a lexicographically sortable timestamp.

var timestamp    = require('lexicographic-timestamp');
var timestamper  = timestamp.timestampStream(16, 9, 'key');
var JSONStream   = require('JSONStream');

var stringify    = JSONStream.stringify(false);

timestamper.pipe(stringify).pipe(process.stdout);

timestamper.write({value : 'hello wisconsin'});

Streams the following to stdout

{"value":"hello wisconsin","key":"0001427769510483.000000000"}

Notice the integer part has 16 characters with leading zeros and the fractional part has 9 characters. This format allows sortable references dating back to the 1970s.