[ENSCORESW-720] and [ENSCORESW-721]. Allowing default HashRef in execute() and...

[ENSCORESW-720] and [ENSCORESW-721]. Allowing default HashRef in execute() and sleep for less than a second.

First issue raised by Lee from EG. He wanted to be able to work with hash refs
in the same way you can do with ArrayRefs. Done and dusted.

Second issue raised by me. Want to sleep for periods less than 1 second for the test
suite sanity.