Consolidate testing environment

- Remove `tests/bootstrap.php` by:
  * Using `autoload-dev` in Composer instead of
    manually adding namespaces to its autoloader on the fly
  * Using PHPUnit `<ini>` XML configuration to set up
    `display_errors`, `error_reporting` and `date.timezone`
- Require `phpunit/phpunit` as a dev dependency instead of depending
  on the platform installation.
  See discussion about that here: silexphp/Silex#1075
- Use new Composer custom commands with `scripts`.
  `composer run-script test` is now just `composer test`.

So you could now just `composer install` and `composer test`. Everything
else is taked care of in a minimalistic, but still well-defined way.

.travis.yml

@@ -12,6 +12,6 @@ install: composer install --optimize-autoloader --no-interaction
 
 before_script: mysql -e 'create database `estaty_test`;'
 
-script: phpunit --coverage-clover=coverage.clover
+script: composer test-ci
 
-after_script: if [ -f coverage.clover ]; then wget https://scrutinizer-ci.com/ocular.phar; php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
+after_script: if [ -f build/coverage.clover ]; then wget https://scrutinizer-ci.com/ocular.phar; php ocular.phar code-coverage:upload --format=php-clover build/coverage.clover; fi

composer.json

@@ -16,11 +16,22 @@
         "doctrine/orm": "~2.4.6"
     },
     "require-dev": {
-        "silex/web-profiler": "~1.0.3"
+        "silex/web-profiler": "~1.0.3",
+        "phpunit/phpunit": "~4.4"
     },
     "autoload": {
         "psr-4": {
             "Estaty\\": "src/"
         }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Estaty\\Test\\": "tests/"
+        }
+    },
+    "scripts": {
+        "test": "phpunit",
+        "test-coverage": "phpunit --coverage-html=build/coverage",
+        "test-ci": "phpunit --coverage-clover=build/coverage.clover"
     }
 }