Added Locale.US to MetricsTrace.java

[Setus]

Fixes #394
Added Locale.US to ensure that the tests were executed using dot decimal punctuation only.

[Setus]

Seems like I still haven't got my CL approved.
Travis seems to be perpetually building, or not at all since I get the message "Hang tight, the log cannot be shown until the build has started." when I clik on Details.

[Setus]

Woohoo! Travis managed to build successfully, just the CL approval remaining then.

[rhyolight]

@Setus We processed the license... something is wrong with the validator. I think it is just a case-sensitivity issue. @cogmission you are good to merge despite the failing "Contributor Validator". I'm working on that.

[rhyolight]

Ok I guess I fixed it. ;)

[cogmission]

Good work @Setus and @rhyolight ! @Setus usually changes go through much much faster - I've been down with a fever...

[Setus]

@cogmission Don't sweat it, it's been a fun learning experience, and thanks for putting up with me 😄