#7 Fix number format for JUnit test timings

[Mirko Raner]

Test timings are currently reported with improper formatting, e.g.:
[exec] [ebuilder] - testSetDialogNameAndTitleParagragh (1.2599999904632568 s) OK
[exec] [ebuilder] - testSetEditControlValues (0.002000093460083008 s) OK
[exec] [ebuilder] - testYesNoQuestion (9.999275207519531E-4 s) OK
The timings should use the same format that is used by Eclipse's JUnit view.