Made nextStep and previousStep functions publicly accessible
Added missing commas
Add step bullets option for tour
Fix IE8 bug in filter() + fix a bug in data-step
Update v0.6.0 changelog + add new roadmap
Update README for v0.6.0
Update version number to v0.6.0
Add minified version of v0.6.0
Merge branch 'master' of https://github.com/usablica/intro.js
Change examples index
Fix stacking context bug caused by opacity
Calling exit() on null issue solved
readme update: add where-to-get section
added onafterchange method, and call it just before the end of _showElement method

difference with onchange is that onchange is executed first time upon entering _showElement method. This will fail if we want to, for example, set focus to the current input element being shown, because the element is modified in _showElement method. onafterchange is executed just before the end of _showElement method, so any changes to the current element will persist. I found this especially useful when trying to set focus to an input element which is currently being intro-ed using jquery's .focus().
Do not add top marging if step numbers are hidden
Allow scolling to element to be set as option

* Auto-scrolling isn't always the user experience you want. Allow it to
 be turned off.
Added method _cloneObject

Added method _cloneObject makes a copy of the settings, that data is not overwritten.
Add donation button
Update index.html

typo and RTL definition
fix issue with single-step pages (closes #229)

* Fixes issue with "Done" label not shown on pages with a single
data-step.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>