Merge branch '48-composer-allow-installation-of-dev-versions-by-default' into 'develop'

Resolve "Composer: Allow installation of dev versions by default"

Closes #48

See merge request !39

composer.json

 {
   "name": "t3o/typo3.org",
   "description": "Website for TYPO3.org",
-  "minimum-stability": "stable",
+  "minimum-stability": "dev",
+  "prefer-stable": true,
   "authors": [
     {
       "name": "t3o team",