collect_without_dimension not in latest release

[Jackleberry]

I'd like to use the collect_without_dimension option when collecting varnish metrics with the cloudwatch handler. I see it in the code base but not in the latest release even though the code was added before the release date.

self.valid_config = ('region', 'collector', 'metric', 'namespace',
                             'name', 'unit', 'collect_by_instance',
                             'collect_without_dimension')

https://github.com/python-diamond/Diamond/blob/master/src/diamond/handler/cloudwatch.py#L88

Would it be possible to create a new release that includes these changes?

[shortdudey123]

Use #709 to track a new release.