Fix case of frozen parent workers on shutdown

Merge pull request #22 from catmullet/fix_frozen_parent_workers

fix frozen parent workers on cancel

Added multiple improvements

• Better handling of channels
• Better use of resources
• Added valid go mod file

Fixing potential context resource leak

Merge pull request #7 from catmullet/fix-potential-ctx-leak

fix potential context resource leak

Adding ability to set timeout and deadline for workers

Added additional methods off of the worker

• SetTimeout(time.Duration)
• SetDeadline(time.Time)
• IsDone() returns context cancellation or error through <- chan struct{}

Fixing issue with timeout when error tries to bubble up

Merge pull request #3 from catmullet/fix-error-return

Fixing timeout issue with errors and add example of timeout with error

Minor readme modifications

v1.0.1

Update issue templates

Initial Major Release

v1.0.0

Clean up some globals