Remove unneeded dependencies

Removes each of:

- zend-filter
- zend-form
- zend-log
- zend-view

as each component was used only to test specific instantiation patterns, each of
which could be mimiced via generic test assets or PHP built-in classes.

composer.json

@@ -19,22 +19,15 @@
         "zendframework/zend-stdlib": "^2.7 || ^3.0"
     },
     "require-dev": {
-        "zendframework/zend-filter": "^2.6",
-        "zendframework/zend-form": "^2.7",
-        "zendframework/zend-log": "^2.7",
-        "zendframework/zend-view": "^2.6",
         "fabpot/php-cs-fixer": "1.7.*",
         "phpunit/PHPUnit": "~4.0"
     },
-    "suggest": {
-        "zendframework/zend-servicemanager": "Zend\\ServiceManager component"
-    },
     "minimum-stability": "dev",
     "prefer-stable": true,
     "extra": {
         "branch-alias": {
             "dev-master": "2.5-dev",
-            "dev-develop": "3.0-dev"
+            "dev-develop": "2.6-dev"
         }
     },
     "autoload-dev": {

test/DiCompatibilityTest.php

@@ -12,6 +12,7 @@
 use BadMethodCallException;
 use Exception;
 use PHPUnit_Framework_Error;
+use SplStack;
 use Zend\Di\Di;
 
 class DiCompatibilityTest extends \PHPUnit_Framework_TestCase
@@ -41,13 +42,9 @@ public function testDiSimple($class)
     public function providesSimpleClasses()
     {
         return [
-            ['Zend\Di\Di'],
-            ['Zend\EventManager\EventManager'],
-            ['Zend\Filter\ToNull'],
-            ['Zend\Form\Form'],
-            ['Zend\Log\Logger'],
-            ['Zend\Stdlib\SplStack'],
-            ['Zend\View\Model\ViewModel'],
+            [Di::class],
+            [SplStack::class],
+            [TestAsset\BasicClass::class],
         ];
     }