2.3.0 - 2016.04.24

• Added asap for enqueuing microtasks, stage 0 proposal
• Added well-known symbol Symbol.asyncIterator for stage 2 async iteration proposal
• Added well-known symbol Symbol.observable for stage 1 observables proposal
• String#{padStart, padEnd} returns original string if filler is empty string, TC39 meeting notes
• Object.values and Object.entries moved to stage 4 from 3, TC39 meeting notes
• System.global moved to stage 2 from 1, TC39 meeting notes
• Map#toJSON and Set#toJSON rejected and will be removed from the next major release, TC39 meeting notes
• Error.isError withdrawn and will be removed from the next major release, TC39 meeting notes
• Added fallback for Function#name on non-extensible functions and functions with broken toString conversion, #193