Cleanup zshrc

* remove duplicates with zlogin
* order by functions first, then bindings, then exports
* lowercase `setopt` arguments for consistency with `setopt` output
Use Brewfile
Correctly link to rcm in README
Use thoughtbot/rcm in Brewfile
Add rbenv shims and trusted binstubs to PATH

Our expected way of managing Rubies is with rbenv:

https://github.com/thoughtbot/laptop/blob/master/common-components/ruby-environment

This commit loads rbenv in `zshrc` as recommended by the rbenv docs:

https://github.com/sstephenson/rbenv#basic-github-checkout

Assuming the binstubs for a project are in the local bin/ directory, we
can even go a step further to add the directory to shell $PATH so that
rspec can be invoked without the bin/ prefix:

    export PATH="./bin:$PATH"

Doing so on a system that other people have write access to (such as a
shared host) is a security risk:

https://github.com/sstephenson/rbenv/issues/309

The `.git/safe` convention addresses the security problem:

https://twitter.com/tpope/status/165631968996900865

This zsh fix may be necessary for OS users in order to fix a bug:

https://github.com/thoughtbot/laptop/blob/master/mac-components/zsh-fix
Complete parity commands like heroku

Adds tab completiong to `production` and `staging` which acts as tab
completion to heroku.
Add psqlrc
Update copyright to 2014
Silver Searcher added
Heroku logs nocorrects
No more NERDtree
Sparkup
Postgres App added to the PATH
Scss syntax for vimming
Zshrc.local added
Setup on the latest @hward machine