skip linking LICENSE file during install
Use rcm instead of ./install.sh

The rcm suite is designed to replace the `./install.sh` script found in
this and many other dotfiles repos across GitHub. By using rcm users can
combine multiple dotfiles repos, tag dotfiles, have host-specific
dotfiles, and other powerful features.

This commit removes `install.sh`, updates the README, adds a post-up
hook that vundles the vim bundles, and adds a `rcrc` configuration that
ignores `README.md` and `LICENSE` and sets the dotfiles directory to
just `dotfiles`.
Always update from vundle

Previously, the after-up hook would only do a `:BundleInstall` when
installing vundle for the first time. This is inconsistent with the
pre-rcm process, and also less convenient.
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.
Local aliases.
Local gitconfig.
Gem configuration.
Sublime Text subl CL shortcut
Zsh git functions
Hub zsh completion.
Local zshrc config
Local zlogin config, including prompt
Use HTTPS/SSH for Github.
Ignore things stored in dotfiles or containing private data

Ignore bash, curl, git, pow, ruby (gem), ssh, tmux, vim, and zsh
configuration.
Add tslime.vim