Update all Docker::Container#exec examples  to use an Array.
Update all Docker::Container#exec examples  to use an Array.

The documentation implies that you can send a plain string but this
is not true, as Docker will flip out and go crazy when that happens so the
solution here is to send an Array.
chasebolt/docker-api,swipely/docker-api,someara/docker-api,ComputeStacks/docker-api,swipely/docker-api,someara/docker-api,chasebolt/docker-api,moritzheiber/docker-api,ComputeStacks/docker-api,moritzheiber/docker-api,pwnall/docker-api