Add docker for testing (#11)

Author: BrainMaestro

Dockerfile

@@ -0,0 +1,7 @@
+FROM composer:1.5
+
+COPY . /app
+
+RUN composer install
+
+CMD ["/bin/sh", "./docker.sh"]

docker.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+./vendor/bin/phpunit