Limit hashCode of Comparable* to 32 bits.
Add onCancel tracking to transformers.
Remove diagnostic print() function.
Remove more diagnostic print functions.
Merge pull request #57 from alxhub/hashcode-sanity-fix

Limit hashCode of Comparable* to 32 bits.
Switch comment.
Merge pull request #58 from alxhub/transformers-should-cancel

Propogate Stream cancellation through transformers, including a patch to RequestTrackingTransformer to properly track cancellation.