0.2.0 mega update
0.2.0 mega update

+ support for async transformers
+ add Fly.prototype.writer method to append writers / IO hooks (concat, etc)
+ add option to run the promise sequence in parallel to each expanded set of globs

JimChenAnother/fly,dieface/fly,DigitalCoder/fly,MadcapJake/fly,iamstarkov/fly,JimChenAnother/fly,DigitalCoder/fly,yang-wei/fly,halhenke/fly,silverbux/fly,alandipert/fly,dieface/fly,elton0895/fly,iamstarkov/fly,kesne/fly,Aweary/fly,kashiro/fly,Aweary/fly,yang-wei/fly,elton0895/fly,iamstarkov/fly,SerkanSipahi/fly,MadcapJake/fly,alandipert/fly,MadcapJake/fly,Aweary/fly,andrewsokolov/fly,DigitalCoder/fly