Fix version processing on BSD systems.

BSD systems ship with the original sed; lacking a host of GNU
extensions. However both GNU sed and POSIX sed support the -E flag
for extended regular expressions which are close to the change this
is replacing.

See the descriptions of extended REs in IEEE Std 1003.2 (aka POSIX.2)
or re_format(7) on BSD systems. What matters for this is that the
+ operator works and that it and the grouping operators no longer
need to be escaped.

completion: Complete only external command for 'run'.

Fix: list-tracked in subdir would print invalid paths

The difference is easiest to see when the following style is in effect:
.
	zstyle ':completion:*' group-name ''

Fix commit.

Fix parsing of Git version numbers

completion: Return the correct error code from __vcsh_*.

completion: Set the context correctly in 'foreach'.

completion: Pass GIT_DIR to _git.

Do not use shared Git repositories

docs: Clarify what 'enter' does.

Add bash-completion

Fixes #230

Shared repositories were created using `git init --shared=0600` with the intent
of keeping configuration data private. Git reports an error if "shared"
repositories are created with private permissions. (Due to an apparent bug, the
error was not reported before git-2.13.2.)

Instead of creating a shared repository, use `umask 0077` to make created files
accessible only to the current user. The umask setting is inherited by child
processes and respected by Git.

This enables file completion at «vcsh foo add <TAB>».

The Git minor version now has two digits, so fix the regexp parsing it.
We'll also anticipate the future and handle the time when the major
version hits 10 and parse accordingly

Signed-off-by: martin f. krafft <madduck@madduck.net>

Fix documentation for running git commands

Commit is currently broken. This fixes it by shifting the command line
arguments to remove "commit" and by correctly quoting "$@".

Fixes #204

Fix git version parsing when there are spaces

Fix write_gitignore for git version >= 2.7

As of git version 2.7 it is no longer necessary to include parent
directories in the list of files not to be ignored.

This fixes #195.

Thanks to Matt S Trout

This reverts commit d5c11e43.

Turns out you need to `apt-get update` all of a sudden...

This reverts commit 3e6f3366.

Seems their infrastructure migration went not quite as expected...