Made the Tag::createInstance() create generic tag objects when there are uppercase letters in the tag name

(this fixes phpDocumentor/phpDocumentor2#672).

src/phpDocumentor/Reflection/DocBlock/Tag.php

@@ -68,7 +68,8 @@ class Tag implements \Reflector
         ).'Tag';
         $class_name = 'phpDocumentor\\Reflection\\DocBlock\\Tag\\' . $tag_name;
 
-        return (@class_exists($class_name))
+        return ($matches[1] === strtolower($matches[1])
+            && @class_exists($class_name))
             ? new $class_name($matches[1], isset($matches[2]) ? $matches[2] : '')
             : new self($matches[1], isset($matches[2]) ? $matches[2] : '');
     }

tests/phpDocumentor/Reflection/DocBlockTest.php

@@ -93,6 +93,45 @@ DOCBLOCK;
         );
     }
 
+    public function testTagCaseSensitivity()
+    {
+        $fixture = <<<DOCBLOCK
+/**
+ * This is a short description.
+ *
+ * This is a long description.
+ *
+ * @method null something()
+ * @Method({"GET", "POST"})
+ */
+DOCBLOCK;
+        $object = new DocBlock($fixture);
+        $this->assertEquals(
+            'This is a short description.',
+            $object->getShortDescription()
+        );
+        $this->assertEquals(
+            'This is a long description.',
+            $object->getLongDescription()->getContents()
+        );
+        $tags = $object->getTags();
+        $this->assertEquals(2, count($tags));
+        $this->assertTrue($object->hasTag('method'));
+        $this->assertTrue($object->hasTag('Method'));
+        $this->assertInstanceOf(
+            __NAMESPACE__ . '\DocBlock\Tag\MethodTag',
+            $tags[0]
+        );
+        $this->assertInstanceOf(
+            __NAMESPACE__ . '\DocBlock\Tag',
+            $tags[1]
+        );
+        $this->assertNotInstanceOf(
+            __NAMESPACE__ . '\DocBlock\Tag\MethodTag',
+            $tags[1]
+        );
+    }
+
     /**
      * Tests whether a type is expanded with the given namespace and that a
      * keyword is not expanded.