merged branch GromNaN/archive-composer (PR #491)

Commits
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64185928 Add stability to dev for archive skeletons (fix GH-489)

Discussion
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Add stability to dev for archive skeletons (fix GH-489)

The Silex archives are not correctly built since the minimum-stability option was removed from composer files : a189265a

There is no stable version of Silex available yet.

Fix GH-489

bin/skeleton/fat_composer.json

 {
     "require": {
-        "silex/silex": "1.0.*",
+        "silex/silex": "1.0.*@dev",
         "symfony/browser-kit": "2.1.*",
         "symfony/console": "2.1.*",
         "symfony/css-selector": "2.1.*",

bin/skeleton/slim_composer.json

 {
     "require": {
-        "silex/silex": "1.0.*"
+        "silex/silex": "1.0.*@dev"
     }
 }