Making selectors for steps more specific

I need to have multiple wizards on the same page. The current selectors get every step on the page when responding to next events.  This will fix that.
Scope jQuery selectors to allow for multiple wizards on the same page

Without this change, clicks on data-target'd elements, such as the
wizard steps list, would cause a global search and update of the active
tabs.  By scoping it to this.$element like the other selectors, you can
have multiple wizards on the same page.
Merge pull request #253 from nephiw/patch-1

Making selectors for steps more specific
Merge branch 'master' of https://github.com/ExactTarget/fuelux
Merge pull request #260 from grexican/master

Scope jQuery Selectors to allow for multiple wizards on the same page
Fix disable support for Opera

Changed the logic for determining if a checkbox should be disabled to start with to use the 'is' jQuery method to the 'prop' jQuery method as not all versions of Opera support the :disabled pseudo selector.
Fix disable Opera support

This change will fix support for disabled in the most recent version of Opera and several older Opera version.
Merge pull request #266 from nephiw/patch-3

Fix disable support for Opera
Merge pull request #267 from nephiw/patch-4

Fix disable Opera support
added a note on volo install
Merge tag '2.4.0'

Conflicts:
	src/radio.js
updating merge issues with radio.js, which will in turn fix travis build.
Merge pull request #276 from vernak2539/fixing_radio_merge_errors_and_travis_build

updating merge issues with radio.js, which will in turn fix travis build and fixing #275
merging fixes to 2.4.0 into 2.5.0-wip