BLK-11 Naive email block implementation

Signed-off-by: Oren Leiman <oren@neutral.io>
Email block. Test stub

Signed-off-by: Oren Leiman <oren@neutral.io>
BLK-11 Tests and removes threading from email block

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

Feature/email