Fix regression in camelize().

The input should not be lowercased before camelizing, as this can cause
inputs that were previously camelized to create incorrect results.

Refs #6735

lib/Cake/Test/Case/Utility/InflectorTest.php

@@ -460,6 +460,20 @@ public function testInflectorUnderscore() {
 		$this->assertSame(Inflector::underscore(false), '');
 	}
 
+
+/**
+ * Test camelize()
+ *
+ * @return void
+ */
+	public function testCamelize() {
+		$this->assertSame('BlogArticles', Inflector::camelize('blog_articles'));
+		$this->assertSame('BlogArticles', Inflector::camelize('blog articles'));
+		$this->assertSame('MyPlugin.MyClass', Inflector::camelize('MyPlugin.MyClass'));
+		$this->assertSame('MyPlugin.MyClass', Inflector::camelize('my_plugin.MyClass'));
+		$this->assertSame('MyPlugin.myClass', Inflector::camelize('MyPlugin.my_class'));
+	}
+
 /**
  * testVariableNaming method
  *

lib/Cake/Utility/Inflector.php

@@ -500,7 +500,6 @@ public static function underscore($camelCasedWord) {
  */
 	public static function humanize($lowerCaseAndUnderscoredWord) {
 		if (!($result = self::_cache(__FUNCTION__, $lowerCaseAndUnderscoredWord))) {
-			$lowerCaseAndUnderscoredWord = self::underscore($lowerCaseAndUnderscoredWord);
 			$result = explode(' ', str_replace('_', ' ', $lowerCaseAndUnderscoredWord));
 			foreach ($result as &$word) {
 				$word = mb_strtoupper(mb_substr($word, 0, 1)) . mb_substr($word, 1);