Add namespaces to generate-themes-doc.fish

* Resolves oh-my-fish/oh-my-fish#116

Add technicolor package

Remove `basename` from core library

The features added by this function are not used anywhere.

Fix #151

autoload: Use `set -e` to remove components from paths

omf.repo.pull: Use helper functions to fix code repetition

registry: add fonts package

registry: add vcs plugin

registry: Add errno plugin

Add https:// to curl calls in README and install script

Add a new theme: Sushi.

omf.repo.pull: Simplify stashed flag using set -q

omf/templates: Remove Travis from scaffolding

Rewrite bundle install to conform with latest `omf.install` interface

Rewrites the code, as now `omf.install` is type
agnostic, and any -- preceded parameter will
be interpreted as package name.

require: Cleanup previously sourced init functions

Overhaul install and update code

Support `omf install https://github.com/oh-my-fish/plugin-jump.git`

Update and install were one thing before.

- Install does not do update.
- Share code when installing from URL or name.

Add jump plugin repo

Fixes a regression in update process added in #115

As #115 migrated list functions, after updating Oh My Fish code
the omf.list_installed_packages gets removed, but is still being
used by the update code.

This commit fixes it by providing a wrapper function.