BLK-10 Dynamic fields block with tests and simple evaluation/exclusion mechanism

Signed-off-by: Oren Leiman <oren@neutral.io>
Merge pull request #1 from nio-blocks/feature/dynamic_fields

BLK-10 Dynamic fields block with tests and simple evaluation/exclusion m...
BLK-5 Queueing block, no tests

Signed-off-by: Oren Leiman <oren@neutral.io>
BLK-5 tests for Queue block

Signed-off-by: Oren Leiman <oren@neutral.io>