Fix dev CI builds

Move silverstripe/config release responsibility to installer
Remove admin artifacts in composer.json

.cow.json

@@ -1,7 +0,0 @@
-{
-  "child-stability-inherit": true,
-  "dependency-constraint": "semver",
-  "vendors": [
-    "silverstripe"
-  ]
-}

.travis.yml

@@ -7,6 +7,10 @@ addons:
     packages:
       - tidy
 
+env:
+  global:
+    - COMPOSER_ROOT_VERSION=4.0.x-dev
+
 matrix:
   fast_finish: true
   include:
@@ -34,11 +38,11 @@ before_script:
   - phpenv config-rm xdebug.ini
   - "export DISPLAY=\":99\""
   - "export XVFBARGS=\":99 -ac -screen 0 1024x768x16\""
-  - "export COMPOSER_ROOT_VERSION=4.0.x-dev"
-  - "if [ \"$na\" = \"\" ]; then composer install --prefer-dist; fi"
+  - composer install --prefer-dist
   - "if [ \"$DB\" = \"PGSQL\" ]; then composer require silverstripe/postgresql:2.0.x-dev --prefer-dist; fi"
   - "if [ \"$DB\" = \"SQLITE\" ]; then composer require silverstripe/sqlite3:2.0.x-dev --prefer-dist; fi"
-  - "if [ \"$CMS_TEST\" = \"1\" ]; then COMPOSER_ROOT_VERSION=4.0.x-dev composer require silverstripe/cms:4.0.x-dev silverstripe/siteconfig:4.0.x-dev silverstripe/reports:4.0.x-dev --prefer-dist; fi"
+  - composer require silverstripe/config:1.0.x-dev silverstripe/admin:1.0.x-dev --prefer-dist
+  - "if [ \"$CMS_TEST\" = \"1\" ]; then composer require silverstripe/cms:4.0.x-dev silverstripe/siteconfig:4.0.x-dev silverstripe/reports:4.0.x-dev --prefer-dist; fi"
   - "if [ \"$CMS_TEST\" = \"1\" ]; then php ./cms/tests/bootstrap/mysite.php; fi"
   - "if [ \"$BEHAT_TEST\" = \"1\" ]; then sh -e /etc/init.d/xvfb start; sleep 3; fi"
   - "if [ \"$BEHAT_TEST\" = \"1\" ]; then (vendor/bin/selenium-server-standalone > selenium.log 2>&1 &); fi"

composer.json

@@ -31,7 +31,6 @@
     "vlucas/phpdotenv": "^2.4"
   },
   "require-dev": {
-    "silverstripe/admin": "^1@dev",
     "phpunit/PHPUnit": "~4.8",
     "silverstripe/behat-extension": "^2.1.0",
     "silverstripe/serve": "dev-master",
@@ -45,8 +44,6 @@
   },
   "autoload": {
     "psr-4": {
-      "SilverStripe\\Admin\\": "admin/code/",
-      "SilverStripe\\Admin\\Tests\\": "admin/tests/",
       "SilverStripe\\Assets\\": "src/Assets/",
       "SilverStripe\\Assets\\Tests\\": "tests/php/Assets/",
       "SilverStripe\\Control\\": "src/Control/",