2015.07.20, v1.3.0

feature:
- (philip) add optional parameters to processingFn: i, n


2015.07.19, v1.2.1

fix:
- (philip) _getFiles: to fast callback call


2015.07.18, v1.2.0

fix:
- (philip) not all files was processed


2015.07.17, v1.1.2

feature:
- (philip) emit progress only when value changed


2015.07.16, v1.1.1

feature:
- (philip) inherit from Emitify


2015.07.16, v1.1.0

feature:
- (philip) add abort, pause, continue

