Remove fork from deprecated APIs, add cancellation
Remove fork from deprecated APIs, add cancellation

Remove fork from deprecated APIs, add cancellation. Closes #1188
BridgeAR/bluebird,HBOCodeLabs/bluebird,HBOCodeLabs/bluebird,HBOCodeLabs/bluebird,petkaantonov/bluebird,BridgeAR/bluebird,petkaantonov/bluebird,petkaantonov/bluebird,BridgeAR/bluebird