Added explanation about the debounce time.

README.md

@@ -25,9 +25,12 @@ aggregate = require('gulp-aggregate');
 concat = require('gulp-concat');
 
 fileStreamWithNoEndEvent = watch({glob: 'watchedScripts/*.js'})
-.pipe(aggregate(function(fileStreamWithEndEvent) {
+.pipe(aggregate({debounce: 10}, function(fileStreamWithEndEvent) {
     return fileStreamWithEndEvent
     .pipe(concat('concatenated.js'))
     .pipe(gulp.dest('public/scripts'));
 }))
-```
+```
+
+The default `debounce` time is 50ms. After `debounce` milliseconds without
+receiving data, the `callback` function will get called with the new aggregated stream.

example.coffee

@@ -8,5 +8,6 @@ gulp.src 'files/*.js'
 .pipe aggregate debounce: 10, (files) ->
   files.pipe es.mapSync (file) ->
     gutil.log gutil.colors.magenta file.path
+  .on 'end', -> gutil.log gutil.colors.magenta 'End event called'
 .pipe es.mapSync (file) ->
   gutil.log file.path

index.coffee

@@ -12,7 +12,7 @@ module.exports = (opts, callback) ->
   unless isFunction callback
     throw new Error "Invalid callback provided: #{callback}"
 
-  opts.debounce ?= 200
+  opts.debounce ?= 50
 
   debouncedCallback = null
   if opts.debounce is 0