Microseconds added to the timepicker

This pull request adds support for microseconds to jQuery-timepicker-addon.
 
phpMyAdmin project uses jQuery-timepicker-addon to edit values for MySQL's time, datetime and timestamp data types. MySQL has recently introduced the ability to have milliseconds and microseconds in the above data types and I am giving a try at upgrading phpMyAdmin code to support this change. While doing that I improved the jQuery-timepicker-addon to support microseconds and I wish to contribute that code back to the  jQuery-timepicker-addon project.

I have a small query. If you decide to merge this pull request when will this be a part of a release? I am asking this because phpMyAdmin project prefers to use a released version over a patched one.