contrib: add dokku client shell script

This is adapted from the one I use in my shell profile scripts. This
kinda-sorta-maybe acts like the `heroku` or `deis` commands and does
some clever reorganization of data before sending it to the server.

To use the app name generator, install the `elfs` rock from Moonrocks.
Merge remote-tracking branch 'upstream/master' into mh-merge-upstream
Merge pull request #1 from expa/mh-merge-upstream

merge from upstream
Reorganized list of available datastore plugins
Change tables to be left aligned
Merge pull request #2 from progrium/master

merge from upstream
Better formatting of plugin tables
Ensure tables have proper width
Merge pull request #771 from progrium/doc-changes

Doc changes
Import ssl certificates

Also ensures output is stored in proper tls directory

Closes #518
Merge pull request #772 from progrium/518-import-ssl

Import ssl certificates
Disable nginx vhosts via `dokku config:set myapp NO_VHOST=1`. Closes #485
Merge pull request #773 from progrium/485-native-no-vhost

Disable nginx vhosts via `dokku config:set myapp NO_VHOST=1`. Closes #485
Remove reference to no-vhost plugin that is now in core
Add the ability to customize an app's hostname using the nginx-hostname pluginhook

Closes #254
Merge pull request #774 from progrium/254-nginx-hostname-hook

Add the ability to customize an app's hostname using nginx-hostname pluginhook
Add PLUGIN:help command to each plugin
Merge pull request #775 from progrium/plugin-help

Add PLUGIN:help command to each plugin
Release 0.3.2
Update man page for new commands