Added begin/finish for progress bar to transition into and out of existence.
Converted indentation to spaces.
incremented versioncode/name
New property: progressiveStart
Finished to merge googlenow pull request
Formatted code
Removed some useless progressbars in the demo
Now uses the currentInterpolator if no interpolator is setted with `spb_interpolator`
Added possibility to set the progressiveStartSpeed and progressiveStopSpeed
Updated readme/changelog
Fixed a bug if `progressiveStop` is called just after `progressiveStart`
The progressStart now also reset the current offset