fix typos in contributing

Move Chrome Driver Version to Env

Update Dusk Documentation

Added new option on how to setup and run Dusk tests without Selenium.

This will allow us to upgrade chrome driver easily. Set the default chrome driver to 2.32.

Also remove the comment and empty line to avoid getting below warning:

```
[WARNING]: Empty continuation lines will become errors in a future release.
```

Install Dependencies to Run Dusk Tests

**Why we need this change?**

Currently we are unable to run Dusk (Browser) tests in workspace container. This change,
is to allow us to install all dependencies needed to run Dust test which consists of

1. Linux packages such as xvfb (x-virtual frame buffer to run browser in headless container) and etc.
2. Chrome browser.
3. Chrome driver.

To install the Dusk dependencies.
1. Update `WORKSPACE_INSTALL_DUSK_DEPS` to true.
2. Run `docker-compose build workspace`.

I've also added couple of aliases to facilitate the preparation of test environment.

1. xvfb = `Xvfb -ac :0 -screen 0 1024x768x16 &` (run x-virtual frame buffer in the background)
2. serve = `php artisan serve --quiet &` (run laravel app in the background)

Once those are installed, we will need to update the default chrome driver argument in Laravel 5.5
from `--headless` to `sandbox`. Below are the steps to run Dusk in workspace.

1. `docker-compose run workspace bash` (get into workspace).
2. `laravel new dusk-test` (generate new lavarel app for testing purpose).
3. `cd dusk-test` (change directory to newly generate app folder).
4. `composer install --dev laravel/dusk` (install dusk via composer).
5. `php artisan dusk:install` (generate dusk files).
6. `sed -i '/APP_URL/d' .env` (remove APP_URL entry in .env)
7. `echo 'APP_URL=localhost:8000' >> .env` (add new APP_URL entry in .env)
8. `sed -i--'s/headless/no-sandbox/g' tests/DuskTestCase.php` (replace the default chrome driver argument).
9. `xvfb` (alias to run Xvfb instance in the background).
10. `serve` (alias to run laravel app in the background).
11. `dusk` (alias to run Dusk test).

Add PHP LDAP extension if needed

Add pecl before mongo install on Dockerfile-56 to stop mongodb breaking building

Fix typo

Fix aerospike client link

Just update the fork

Add artisan aliases

Added below php artisan commonly used aliases:

```
dusk =  php artisan dusk
fresh = php artisan migrate:fresh
refresh = php artisan migrate:refresh
rollback = php artisan migrate:rollback
```

Add Terraform to Workspace

Added Terraform (www.terraform.io) binary to workspace container.
This tool is useful to spawn resources to multiple cloud providers via config files.

Add aerospike.so line to be load on php-fpm

Fixed typo in "nginx"

Just update the fork

Fixes issue #1139, non-responding mirrors.aliyun.com. Reverses 6440ca…

Fixes issue #1139, non-responding mirrors.aliyun.com. Reverses 6440ca84

Make it easier to solve nginx build stuck

add APACHE_PHP_UPSTREAM_TIMEOUT

Update docker-compose.yml

It looks like the 
     219: user: "1000:50" 
statement was added a while back to fix a file permissions issue, but on a completely fresh up it keeps mysql from starting, generating the following.  Removing the line allowed everything to work properly.:

mysql_1                | Initializing database
mysql_1                | mysqld: Can't create/write to file '/var/lib/mysql/is_writable' (Errcode: 13 - Permission denied)
mysql_1                | 2017-09-14T23:55:30.989254Z 0 [Note] Basedir set to /usr/
mysql_1                | 2017-09-14T23:55:30.989559Z 0 [Warning] The syntax '--symbolic-links/-s' is deprecated and will be removed in a future release
mysql_1                | 2017-09-14T23:55:30.989602Z 0 [Warning] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
mysql_1                | 2017-09-14T23:55:30.990877Z 0 [ERROR] --initialize specified but the data directory exists and is not writable. Aborting.
mysql_1                | 2017-09-14T23:55:30.990886Z 0 [ERROR] Aborting

Aws ebcli

Added support of ImageMagick

Fix issue #1011