v0.1.3

• aaca52b Update README: add explanation for the getCurrTarget() (@gnatok)
• d5894b2 Move window.sessionStorage into try catch block. (@nanek)
• 35a2b2d detect when a onNext/onPrev callback updates tour state (@gkoo)
• 4c025eb a little cleanup from the previous commit (@gkoo)
• 25140fb Changed logic to check for typeof currStepNum. Forcing tour to start at step 0 was not working. (@leedavidr)
• bc2af92 makes onCTA use callback helpers (@yeah)
• 7791d6f Small doc update for query selectors. (@marc-hughes)
• 0fbef13 Support arbitrary selectors for targets (@joshjordan)