Initial Bitbucket Pipelines configuration

bitbucket-pipelines.yml

+# This is a sample build configuration for PHP.
+# Check our guides at https://confluence.atlassian.com/x/e8YWN for more examples.
+# Only use spaces to indent your .yml configuration.
+# -----
+# You can specify a custom docker image from Docker Hub as your build environment.
+image: php:7.1.1
+
+pipelines:
+  default:
+    - step:
+        caches:
+          - composer
+        script:
+          - apt-get update && apt-get install -y unzip
+          - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+          - composer install
+          - vendor/bin/phpunit