Alias `lessr` to `less -r`

Preserves colors from input. If you're piping output of other programs
to less, you may also need to tell that program to use colors.  A lot of
programs default to no color when sending output to something that isn't
a terminal.  e.g.

    cat /tmp/somefile.json | jq -C '.' | lessr
Move zsh custom load to end of .zshrc

Didn't really find out why, but it has to be there for the AWS
auto-complete to work, on my MBP with OSX.  Didn't notice any side
effects of moving it.
Upgrade oh-my-zsh
Add `myip` script - looks up external IP address