Add Portainer.io service

Fix php5 Unable to locate gmp.h

* php5 fpm support swoole
* php5 workspace support swoole

fix Getting Started step "docker-compose up -d nginx mysql" missing workspace container.

corrected elasticsearch default username

Fix env variable name

Adding pcntl to php-fpm, php-worker, addresses #1419

* Fix #1544, Unable to locate package libgmp-dev.

Fix install php ext SOAP No package php-soap available

fix #1535 xdebug installation fails when php version is 5.6

Update index.md

Improve working

Add information for Windows hosts when adding custom cron jobs

Remove unused variable PHP_FPM_INSTALL_POSTGRES.

Update min. docker version

Add subversion support in workspace

Update env-example

Update apt sources before installing imagemagick

#1512

Fixed env variable name which points to host source directory.

Add missing syntax to continue line

Use xdebug with Laravel scheduler inside workspace container