Collect all variable assignments in one sorted list
Lower updatetime per vim-gitgutter readme

See
<https://github.com/airblade/vim-gitgutter/blob/fed2dbad3455f18d11d602a42a37233dab8d448b/README.mkd#when-are-the-signs-updated>.

> The length of time Vim waits after you stop typing before it triggers the
> plugin is governed by the setting updatetime. This defaults to `4000`
> milliseconds which is rather too long. I recommend around `750` milliseconds
> but it depends on your system and your preferences.
Add vim-mkdir plugin
Automatically prune remote branches when fetching
Update Zsh bundles
Update Vim bundles
Add two directives to psqlrc

See: <http://robots.thoughtbot.com/an-explained-psqlrc>

* `ON_ERROR_ROLLBACK` for improved error handling.
* `null` for better display of null values.