Fingerprints for Cables and Tables

-constructing tables will leave fingerprints
-snipping cables will leave fingerprints
I chose to use add instead of transfer because I felt that it made things easier for admins ( first print is usually the guy who created it) and I didn't think retaining old prints were important at all. I can change it to use transfer instead, but I would prefer it this way. 

Sent from my iPhone

> On Aug 18, 2014, at 1:12 AM, "Alex" <notifications@github.com> wrote:
> 
> In code/modules/power/cable.dm:
> 
> >  
> >  		for(var/mob/O in viewers(src, null))
> >  			O.show_message("\red [user] cuts the cable.", 1)
> >  
> > +		newcable.add_fingerprint(user)
> add and transfer here
> 
> —
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