Example to both increase and decrease the value of a progress bar
Changed behavior to show the bar after completion with an option to hide
it
Merge pull request #37 from visionmedia/feature/backnforth-example

Example to both increase and decrease the value of a progress bar
Merge pull request #41 from visionmedia/visible-progress

Changed behavior to show the bar after completion with an option to hide it
Merge remote-tracking branch 'origin/master' into feature/exact-percentage