Type in Readme: Change version to 7.1

See merge request !101

MySQL Dependency Fix

I got a load error when I overwrote the below options.
- "external_database": true
- "database_adapter": "mysql"

If external_database is true and using mysql, this processing does not include "database::mysql", so it can't load 'mysql'.

```
LoadError
cannot load such file -- mysql

Cookbook Trace:
/var/lib/aws/opsworks/cache/cookbooks/database/libraries/provider_database_mysql_user.rb:29:in `require'
/var/lib/aws/opsworks/cache/cookbooks/database/libraries/provider_database_mysql_user.rb:29:in `load_current_resource'

Resource Declaration:
 In /var/lib/aws/opsworks/cache/cookbooks/gitlab/recipes/database_mysql.rb
23: mysql_database_user gitlab['database_user'] do
24:   connection mysql_connection
25:   password gitlab['database_password']
26:   host mysql['client_host']
27:   action :create
28: end
29:
```

See merge request !77

Remove custom postgresql fork

The custom fork wasn't working properly for Ubuntu 14.04

Tested on Ubuntu 14.04
Ruby 2.1.2
Chef 11.6.2

bundle exec rspec was run and passed

#30

See merge request !100

Cron to make backups

Add a backup recipe to configure cron to make backups

See merge request !98

Make max upload size configurable

In order to upload large git objects, nginx's `client_max_body_size` and gitlab's `max_size` should be configurable.

See merge request !95

Ldap filter

Added ability to place LDAP filter in the cookbook.  Also added an example of a recursive query for user filtering.

See merge request !94

Removing the cookbook for the custom fork for postgresql. The community cookbook has progressed past this point.

Release/7.0

Nginx asset path

Fix git double installation

This MR removes `git` from the list of packages installed by `gitlab` since `git` is installed from source via `include_recipe "gitlab::git"`.

Added specs for this change.

Feature custom nginx install

This new attribute (`node['gitlab']['install_nginx']`) will prevent nginx installation. Only the installation part is affected by this change, not gitlab nginx configuration.

This enable us to install our custom, source version of nginx.

Fix missing unzip git install rhel

This is a re-submit of [MR !61](https://gitlab.com/gitlab-org/cookbook-gitlab/merge_requests/61) without problems mentioned there and with proper spec added proving the fix works.

Add option for Vagrant development

Vagrant development was deprecated in favor of a metal installation per issue #51. This raises the barrier to entry for potential contributors. Issue #54 was opened to bring Vagrant back as one development option.

This MR adds a Vagrantfile that creates a box suitable for local development. All processes are run by the "vagrant" user, hopefully sidestepping any problems the arise from using two different accounts.

The configuration is largely the same as the Vagrantfile originally included with the cookbook, but it removes the "git" user, performs checks for required plugins, adds an option to disable port forwarding, and fixes some ruby permission warnings with synced directories. It also adds a simple `gitlab` command alias to start the service.

This has been tested on Mac OS X v10.9.

 * Git is already installed from source, no need to install the package
   for it also. Moreover, it is not present in the other list of packages
   for platform other than rhel.
 * Added spec to prove it.

Rewrite git

Conflicts:
	doc/development.md