Inconsistencies in some functions

[etiennebacher]

Some additional comments:

I noticed that methods isActive() and getCurrentStep() are triggering too often. I am not sure why this is. I tried wrapping these as a reactive expression but this did not fix the problem. My application responsiveness is lost due to the eternal loop of rechecking whether the Conductor is active.

From my experimentation:

• The getCurrentStep() method triggers on the step being left.
• The isOpen() method triggers on the step being entered.
  This subtly is missing from the documentation.

Originally posted by @nhward in #81 (comment)