New feature request

please add 

please add random function for incremental and delay.

so if i do something like this

$( '.tick' ).ticker(
{
  incremental: random(1,9)
  delay: random(100,900)
  separators: true
});

incremental value and delay will random picked from the min and max values.

so i can use it as its showing some live feed of counts of new members/total earnings etc.

hope this helps.
