Change burst to use ms instead of s

Also renames that variable, and adds a burst example.

Change-Id: I53787612f287e71d9afb5618bd445c8aa72fd39e
Reviewed-on: http://codereview.qt-project.org/5349


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Martin Jones <martin.jones@nokia.com>