Change check for enabled to is(':not([disabled])')

This is a more accurate check. The previous check was preventing me from moving forward in the tour. See the explanation copied from jQuery documentation on :enabled.

"Although their resulting selections are usually the same, :enabled selector is subtly different from :not([disabled]); :enabled selects elements that have their boolean disabled property strictly equal to false, while :not([disabled]) selects elements that do not have a disabled attribute set (regardless of its value)."

Changing to :not([disabled]) fixed the issue for me.
Merge pull request #1 from timkindberg/master

Change check for enabled to is(':not([disabled])')
Allow skipping while moving backward

Add the ability to skip while moving backward (via previous click or other) in the tour. If the previous step is not available, then the tour will try the step before it.
Merge pull request #2 from timkindberg/master

Allow skipping while moving backward
Update bootstrap-tour.js.html

Fix links to bootstrap assets in docs.
Merge pull request #3 from gnomeontherun/patch-1

Update bootstrap-tour.js.html
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