Windows uses two whitespace bytes as line endings. (#484)

Since windows issues both a CR and a LF, we'll have to accept at least two bytes. This brings the whitespace handling in line with the other whitespace tests in the same regex.

tests/phpunit/ImboUnitTest/Http/Response/Formatter/XMLTest.php

@@ -481,7 +481,7 @@ public function testCanFormatGroupsModel() {
         $model->expects($this->once())->method('getCount')->will($this->returnValue($count));
         $model->expects($this->once())->method('getGroups')->will($this->returnValue($groups));
 
-        $this->assertRegExp('#<imbo>\s*<search>\s*<hits>2</hits>\s*<page>1</page>\s*<limit>5</limit>\s*<count>1</count>\s*</search>\s*<groups><group>\s*<name>group</name>\s*<resources>\s*<resource>user.get</resource><resource>user.head</resource>\s*</resources></group></groups>\s</imbo>$#', $this->formatter->format($model));
+        $this->assertRegExp('#<imbo>\s*<search>\s*<hits>2</hits>\s*<page>1</page>\s*<limit>5</limit>\s*<count>1</count>\s*</search>\s*<groups><group>\s*<name>group</name>\s*<resources>\s*<resource>user.get</resource><resource>user.head</resource>\s*</resources></group></groups>\s*</imbo>$#', $this->formatter->format($model));
     }
 
     /**