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changes:
- easily customize the colors via variables
- command to switch on/off the custom prompt
- Improved documentation with example on how to append on the prompt.

Fixes #7261

This fixes the RPROMPT setting for fishy theme so as to preserve its old value,
instead of overwriting it like it did before.

Also, fix unnecessary export of RPROMPT in aws plugin.

The 1.7.2 release was published in July 2010 [1]. It's about time to stop
supporting older versions.

Fixes #4583

[1] https://github.com/git/git/releases/tag/v1.7.2

Fixes #7568
Closes #4542
Closes #5163
Closes #6868

I was adding autojump on a new machine and annoyingly forgot that autojump
was to be installed on its own. This may be helpful.

Signed-off-by: Maximilian Güntner <code@maschinenpsychologe.de>

Fixes #5779
Fixes #5405

* Use stash 'push' or 'save' depending on Git version

A utility function now parses the output of git --version and set the
alias for git stash to 'git stash push' iff the current version of Git
is 2.13 or greater; it falls back to 'git stash save' otherwise.

yaourt -> yay

Fixes #6999

Fixes #7483
Closes #4973

Source: https://github.com/zsh-users/zsh-completions/blob/master/src/_httpie

Related: #7308

Fixes #7480

The whois.geek.nz resolver is now dead.

Fixes #7297

Fixes #6620

A default PS1 doesn't make sense: the user will either choose a theme or not
care about a default prompt since they can set it themselves.

Fixes #7054

Fixes #6981. 

Fixes #4151

Fixes #6805

* Stop loading git plugin
* Update completion and git-prompt to v2.10
* Update completion to v2.14

Fixes #5453.

Fixes #5741