Update demo smartwizard2-validation.php to hide stale validation error msgs

Once 'showMessage' displays an error message, the message persists after the error has been cleared, even into the next step. This change will call 'hideMessage' to  hide the error message once the error has been cleared.
Merge pull request #19 from mhutchin/patch-1

Update demo smartwizard2-validation.php to hide stale error msgs
Fixes slideleft animation (ericmuyser)

https://github.com/mstratman/jQuery-Smart-Wizard/pull/20
Fixed the height just for visible elements
Change jquery dependency to 2.0.0
Added option for includeFinishButton (to hide/show the 'Finish' Button)
Allow vertical scrollbar (using overflow-y)
Fixed a spacing problem when step boxes are stacked. Optimised some CSS values.
Initial commit for autoSteps. Creates the step buttons in the top automatically. Needs further testing
Automatically add an id attribute to the divs, if none is set
Merge pull request #30 from hmleal/fixHeight

Fixed the height just for visible elements
Added "autosteps". When no ul with steps are provided, they will be automatically created.
Merge pull request #37 from rparree/auto-steps-when-no-steps

Auto steps when no steps