properly correct the CSS to show the red number per tooltip: now the red circle is bigger and fits each number easily.
feature: provide role-specific intro texts: site visitors may have different roles and require different assistance and thus feature makes this possible, including switching roles 'live' in-app.

Two examples are included which showcase the augmented behaviour.
- documented the goToStep() API a bit more, mentioning that the step number is '1 based'

- introduced the getCurrentStep() API so user code can store the current IntroJS state when the overlay is clicked or the introduction is aborted another way, to be continued at a later time.

- bumped version to 0.6.1
initial prepwork phase 1 for preconditioning and tracking introduction state.
complete the work done in SHA-1: 21c50cdb36879b1f6884ad27f49893330fe525cf: all introJS attributes are `data-intro-` PREFIXED -- which means that the old `data-intro` DOM attribute is now named `data-intro-text`
Merge branch 'master' into gh-pages