Restore Initial Meaningful Test Infrastructure

This testing package was initially a part of flarum/core, but was
extracted during the 0.1.0-beta.16 release cycle. The extraction was
made through git's filter-branch tool to preserve some useful history in
the repository.

php-packages/testing/.gitignore

@@ -0,0 +1,9 @@
+/vendor
+composer.lock
+composer.phar
+node_modules
+.DS_Store
+Thumbs.db
+/tests/integration/tmp
+.vagrant
+.idea/*