Parse get_subjects reponse body

Closes #28

+ Include MultiJson as a dependency
+ Bypass Zookeeper setup if ZK_URL is already defined
That code was there previously and also doesn't work on my system. I just
moved it inside the unless statement so I could pass the zookeeper url as
an environment variable.
On Nov 13, 2014 3:06 AM, "Campbell Allen" <notifications@github.com> wrote:

> In spec/support/zk_setup.rb:
>
> >
> > -`zkServer start #{ CELLECT_ZK_CONFIG } > /dev/null 2>&1`
> > -ENV['ZK_URL'] = 'localhost:21811'
> > +
> > +  if `echo ruok | nc 127.0.0.1 21811`.chomp == 'imok'
>
> that echo ruok | nc doesn't work on my version of netcat (netcat-openbsd),
> http://stackoverflow.com/questions/21846617/why-pipeline-content-to-command-nc-wont-work.
>
>
> I assume this will work in a docker container but may not work on systems
> that haven't got the traditional version of netcat installed.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/zooniverse/Cellect/pull/29/files#r20278916>.
>