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The old implementation would attempt to load both the default and custom
implementations, with the custom one coming first, so it would get clobbered
by the default version.

Updates OMZ's copy to commit 2c295432175990c1bb4e90bc13f609daa67a25d6 from zsh-users/zsh-history-substring-search

- Delete useless #!zsh
- Simplify gradle build file check
- Format comments and delete TODO stuff (already dealt with)
- Use `$()` syntax for cat commands

In bindkey strings, "^[" and "\e" mean the same thing. They're both notations for Escape.

Closes #4616
Changes the `plugins=(... mercurial ...)` to be closer to correct zsh syntax, removing commas and extra spaces.
Revises discussion on configuring themes to avoid sounding like users should modify the theme definition file in the main OMZ folder. Prioritizes the suggestion of using a theme which already supports hg_prompt_info.

Two similar aliases which were causing issues.

Removes old completion setup that breaks with current _git and _hub completions.
Ruby is no longer required by hub; removes that test.
Does not define new completions for hub; they are now defined by hub itself.
Change the functions to use hub to create the repos on GitHub.
Add error checking to the functions.
Removes apparently-unused _github completion definition.

Closes #3248
Closes #4570

* `cfp` alias was referencing an old version of the `cf` command which
no longer exists. This has been updated to reference a valid command.

Check pyenv-virtualenv can eval before use it.
Signed-off-by: Superbil <superbil@gmail.com>

Fixes bug introduced in #4440

Removing legacy rails-specific aliases from the Textmate plugin. This is probably best handled as a custom plugin.

This changes all the __git_* functions it was defining to __gitex_* to avoid collisions with the internal functions used inside _git from zsh.

The Atom plugin is obsolete.

See #3193

Currently, encode64 plugin using `echo -n` to print the content
of $1 variable. This approach will not work with arbitrary data,
which contains sequence of escaped characters, since when many
`echo` implementation will expand them.

This commit chage the usage to `printf`, which is builtin in all
POSIX shells and can print arbitrary data reliability.