changing removing stringed numbers from fake dynamo tests

Hello @x-ma, 

Please review the following commits I made in branch 'giannic-fakedynamo-testnums'.

0dc586a9fdb6c53f3012ef7dad9434cca9f013c7 (2014-03-04 12:41:53 -0800)
changing removing stringed numbers from fake dynamo tests

R=@x-ma