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Remove `local` stuff that cause an error in shell

This uses the version at commit 35c76bf (2015-12-08)
https://github.com/github/hub/commit/35c76bf91dc3d699173599464b9b41cb877ee440

Commit 09d2a597 introduced the bug, which is due to using
single brackets conditions at the same time as *.

This commit should fix it and use double brackets everywhere
else.

Fixes #4699

Add local stuff

Sort pipe dropped and fix 2>/dev/null

Some environments (in my case, cygwin) have PATH variables with directories
with spaces in them, breaking colored-man.
Adding quotes around the PATH environment variable makes the plugin run OK.

Fixes #4085: core -> plugin dependency issue.
Rename it to git_current_branch for clarity that it's git-specific.
Update all plugins that were calling it to use new name.
Fix variable leaks by making more variables in lib/git.zsh local.
Have lib/git.zsh use [[ ]] instead of [ ] everywhere.

This avoids an ordering dependency between this and the vi-mode plugin.

Uses `is-at-least` instead of a numeric comparison hack, so versions with non-numeric bits like "4.5.0-dev5" don't throw errors.

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

Rather than trying to emulate `git commit --amend` using mercurial queues (which might have side effects if you're using MQ for other things) use the `commit --amend` command which was introduced in Mercurial 2.2 (2012-05-01).

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