add simple uptime collector

simple collector to get the machine's uptime in minutes. Somehow I figured this would've already existed but apparently not.
True. I'd forgotten that there was time conversion code. Will fix

On Wednesday, June 25, 2014, Rob Smith <notifications@github.com> wrote:

> In src/collectors/uptime/uptime.py:
>
> > @@ -0,0 +1,37 @@
> > +from diamond.collector import Collector
> > +
> > +import os
> > +
> > +procpath = '/proc/uptime'
> > +divisor = 60
>
> Should likely use the time convertor code
>
>
> https://github.com/BrightcoveOS/Diamond/blob/master/src/diamond/convertor.py#L146
>
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