* include stream chain head mock
* uncomment test
* stream chain head implemented
* remove imports
* chain head stream test
* include stream test with mockgen
* test now passes
* checkin items
* stream tests all passing
* rem learn
* fix up fork checker
* add stream ctx
* gaz, fix test
* fix broken test
* Merge branch 'master' into chain-head-stream
* include context in chain head stream happy path test
* Merge branch 'master' into chain-head-stream
* Merge branch 'master' into chain-head-stream
* Merge refs/heads/master into chain-head-stream
* Merge refs/heads/master into chain-head-stream
