Added DemoClass
[FEATURE #1234] Added sumFoo method to DemoClass
[BUG #4321] Added trailing semicolon in setFoo method.
[FEATURE #1235] Added sortFoo method to DemoClass
[FEAT #5678] Added docblock for DemoClass::sortFoo()
[FEAT #7890] Added new method DemoClass::doNothing() in DemoClass.php