Create hooks response

Related to https://dev.gitlab.org/gitlab/gitlabhq/issues/1900

See merge request !52

Github importer

See merge request !51

typo in message: "accesible" -> "accessible"

Update changelog

See merge request !50

Fix custom hook output

Add missing 'require_relative' in gitlab_net.rb

Prevent 'uninitialized constant GitlabNet::GitAccessStatus'.

See merge request !49

Without this 'require' statement, you get the following error:

```
$ git ls-remote origin
/home/git/gitlab-shell/lib/gitlab_net.rb:30:in `check_access':
uninitialized constant GitlabNet::GitAccessStatus (NameError)
  from /home/git/gitlab-shell/lib/gitlab_shell.rb:63:in `validate_access'
  from /home/git/gitlab-shell/lib/gitlab_shell.rb:24:in `exec'
  from /home/git/gitlab-shell/bin/gitlab-shell:16:in `<main>'
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
```

Better git hook messages

DZ already merged it but we had to revert it because of lack of time to deploy to dev.

See merge request !48

This reverts commit f8453da5.

At least the following things were broken:
- missing require for 'gitlab_access_status' in lib/gitlab_net.rb
- gitlabhq master internal API returns 'true' or 'false', gitlab-shell
  expects JSON

This reverts commit 11311a95, reversing
changes made to 45444597.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	VERSION

Revert broken things

See merge request !6

This reverts commit cd9e7963.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Delete tags and branches that start with hyphen

Restore hooks PATH before calling ruby.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add custom hook support to CHANGELOG

Custom hooks

- Reset G_ID if the custom pre-receive hook fails
- Use a pipe to feed stdin to the custom pre- and post-receive
  hooks, in the same way that the standalone git works

fixing broken custom pre-receive calls