.aliases: Improve `ips`

Ref. #268 and #269.
Make `.cask` executable
.osx: Minimize windows into their application’s icon

Closes #271.
.aliases: Improve `ips`

Ref. #268 and #269.
Bring Brandon's dotfiles over to Matias' repo.
Uncomment vault code
Moved most aliases and functions out of extra and in to source control. Leave ~/.extra for stuff you want to change without pushing/pulling
Update slate to be cleaner, and have more intuitive keys. Update aliases to include what you expect (and remove some cruft from github clone
Add bundler-exec.

Automatically adds `bundle exec` to appropriate commands (and only when
it should) to avoid having to remember. Replaces similar plugin
functionality in oh-my-zsh.
Need to source the function