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Esc+. works as "last arg" on both bash and zsh. Seems like a shame to introduce a new standard.

Main library should use ZSH native hostname function

This is needed to play nice with plugins that need various hooks.

After a few weeks of using this, I'd prefer this to not be enabled by default. My bad for suggesting that in the first place.

This reverts commit fc49b4a4.

The command C-x C-e opens the current command line for editing
in the editor defined by the $EDITOR environment variable.

Thanks to Craig Bosma and his blog post about this:
http://distrustsimplicity.net/articles/zsh-command-editing

Changes method git_parse_ahead() on git.zsh lib file. Before this
change it checked directly against origin/master branch. Now it
uses $(current_branch) to check for not pushed changes against
the current remote branch.

Modifies the Git lib file (lib/git.zsh), adding three new prompt
methods:

- git_prompt_ahead(): Shows the content of the custom var
  $ZSH_THEME_GIT_PROMPT_AHEAD if the local repository has
  commits ahead from the remote origin repository

- git_prompt_short_sha(): Shows last commit SHA hash in short
  mode wrapped between the content of the custom vars
  $ZSH_THEME_GIT_PROMPT_SHA_BEFORE and
  $ZSH_THEME_GIT_PROMPT_SHA_AFTER

- git_prompt_long_sha(): Shows last commit SHA hash in long
  mode wrapped between the content of the custom vars
  $ZSH_THEME_GIT_PROMPT_SHA_BEFORE and
  $ZSH_THEME_GIT_PROMPT_SHA_AFTER

This reverts commit c3a58b00.

Fix by derekjw. closes #52.

Closes #45 #57 #58 #86.