Prioritize first scheduled items to be finished

[mrjmarcelo]

@cgillum , I added some "order by SequenceNumber asc" on backend implementations to grantee the first scheduled items to be finished first, because when working in heavy load, first scheduled items were executed after the last ones. Please review and approve the PR if its "ok".

prioritize

[mrjmarcelo]

it shall be solved by either:

#108
or
#109

[mrjmarcelo]

Solved on #109