Close #5101

* Add initial list of aliases

* Add lint and diff aliases

* Remove usage section

gitfast: update to the latest upstream Git and a couple of fixes

Sometimes we want to use the function directly (e.g. _git_checkout), for
example when zsh has the option 'complete_aliases', this way, we can do
something like:

  compdef _git gco=git_checkout
Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com>

We can add colour in Zsh without the need of pcmode.
Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com>

Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com>

znt: update to v2.1.15

JIRA Plugin will open rapidboard

Added fossil plugin.

Add rbenv support for ruby version display in the Avit theme

Git alias

Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com>

Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com>

When using the command alias `sfcontainer` or `sfrouter`, the following warning occurs:

> ! [CAUTION] The use of "container:debug" command is deprecated since version 2.7 and will be removed in 3.0. Use the
> ! "debug:container" instead.

Remove the '-s' option from 'gcan!'
Add 'gcans!'. It is the same as the current 'gcan! -s'.

add "-Dmaven.test.failure.ignore=true" .
This option will not ignore all tests but ignore the failures when run tests.

See http://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#testFailureIgnore

[TASK] Vagrant plugin: Add missing vagrant snapshot command

Close #4126

Signed-off-by: NMarc Cornellà <marc.cornella@live.com>

- `custom/example.zshcache` doesn't exist anymore: it's safe to
  ignore.

- `*.swp` files are ignored for no apparent reason. There's nothing
  in the codebase that generates them. This was introduced by @lepht
  in commit f78218f6 on 24 May 2011.

- Files `locals.zsh` and `projects.zsh` are no longer supported for
  putting custom configuration there.

  This is since commit 8debd097 where files were put in a lib/
  folder, but failed to modify the .gitignore file as well.

  The init script was modified as well, so those files aren't even
  being sourced: they are safe to be deleted or ported into a custom
  script.

Instead of .easter-egg files we now have empty .gitkeep files,
like is done as an informal standard.

Close #4764

Signed-off-by: NMarc Cornellà <marc.cornella@live.com>

Close #4938