Add Mac installation instructions

[pjf]

Lots of people use Macs and homebrew, so we should have an install guide for them.

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[pjf]

Pinging @mmcclimon , since I have no mac, and I presume there's a bit of homebrew magic to get dependencies installed. :)

[mmcclimon]

Hmm...all I had to do was to brew install zeromq (or brew install zeromq22 for the older version). I had a bunch of stuff in homebrew already, so I'm not 100% sure that that's all someone from scratch would have to do.

Here are all your apt-get deps, with how I think they wound up on my system. I'm not sure this helps at all, but here it is.

• libzmq-dev -- brew install zeromq
• libexpat-dev -- in /usr/lib, I think by default
• cpanminus -- via perlbrew, but easy enough to get from CPAN (cpan install App::cpanminus)
• make -- installed by default, at /usr/bin/make
• liblocal-lib-perl -- handled by perlbrew again

The other Perl packages I have are handled automatically by perlbrew, but can be gotten from CPAN. I think they're detected as dependencies when installing from dzil listdeps via cpanm, so there might not be anything else to do on Mac.

• libnet-ssleay-perl
• libnet-libidn-perl
• libcrypt-ssleay-perl
• libmethod-signatures-perl

[jessicalegner]

You may have to do this if error on ZMQ: cpanm ZMQ::LibZMQ3