Repromise 0.6.0

Breaking

• Rename new_ to make (#24, #22, John Haley).
• Rename then_ to andThen (#27, #22, Jih-Chi Lee).
• Rename resolve to resolved and reject to rejected (#22).

Additions

• Repromise.Rejectable.fromJsPromise and Repromise.Rejectable.toJsPromise (#25, prompted Louis Pilfold).

Fixes

• Fix function names in docs (#28, Zach Ploskey).