[TwigBundle] changed all Boolean to string in XSD as you might want to use a parameter %...%

src/Symfony/Bundle/TwigBundle/Resources/config/schema/twig-1.0.xsd

@@ -14,14 +14,14 @@
             <xsd:element name="extension" type="extension" minOccurs="0" maxOccurs="unbounded" />
         </xsd:sequence>
 
-        <xsd:attribute name="auto-reload" type="xsd:boolean" />
-        <xsd:attribute name="autoescape" type="xsd:boolean" />
+        <xsd:attribute name="auto-reload" type="xsd:string" />
+        <xsd:attribute name="autoescape" type="xsd:string" />
         <xsd:attribute name="base-template-class" type="xsd:string" />
         <xsd:attribute name="cache" type="xsd:string" />
         <xsd:attribute name="cache-warmer" type="cache_warmer" />
         <xsd:attribute name="charset" type="xsd:string" />
-        <xsd:attribute name="debug" type="xsd:boolean" />
-        <xsd:attribute name="strict-variables" type="xsd:boolean" />
+        <xsd:attribute name="debug" type="xsd:string" />
+        <xsd:attribute name="strict-variables" type="xsd:string" />
     </xsd:complexType>
 
     <xsd:complexType name="form">