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.

Merge all omf list functions

Simplify `omf cd` code

This also namespace the function to `omf.packages`.

refact(pkg/thefuck): use a better, oh-my-fishy thefuck plugin

update some cli completions: remove query and version. add doctor

Rework omf theme code: Integrate with fish_config, ditch refresh calls

- Move theme installation to cli entry point (omf.fish)
- Generalize XDG_CONFIG_HOME code in `omf.xdg.config_home`
- Generalize prompt conflicts check in `omf.checks.fish_prompt`
  * Migrate `omf.doctor` to use it

+ Change theme activation steps
  - Create user function path if not existent
  - Check for conflicts in fish_prompt, aborts if found
  - Remove current theme from autoloading paths
  - Add target theme to autoloading paths
  - Link target theme's fish_prompt to user's
  - Persist selected theme to $OMF_CONFIG/theme

This approach brings two major advantages:

- Theme prompt now shows accordingly in fish_config web interface
- Faster theme changes, reducing it from seconds to some milis
- Avoids calling refresh, which makes users much more happy