forEach async, unfold, iterate, zip, zipWith, interleave, intersperse

Fix try/catch

first idea for unsubscribing

Unsubscribed taken into account

Coding Style and simple test

Added Test and Simplify most

Added Test and Simplify most

Cleaning

Initial

Zip working

Zip/infinite stream

Cleaning for Zip

Added Test and Cleaning

Added zipWith and intersperse

Fix take

Cleaning