extended MockObject for shortcut methods

... of expactations (consistent to shortcuts for returnValues); also extended mocked_class template for new methods in Interface.

## Purpose/Discription
This is a featurerequest for having those shortcutmethods for expectations on mocks similar to the shortCuts of the returnValue (e.g. "->willReturnValue()" or "->willReturnValueMap").

## Effect/Changes in Tests

     $mock->expects($this->once())
     $mock->expects($this->any())
     $mock->expects($this->exactly(12))
     $mock->expects($this->at(12))
     $mock->expects($this->atLeastOnce())
     $mock->expects($this->never())

becomes

     $mock->expectsOnce()
     $mock->expectsAny()
     $mock->expectsExactly(12)
     $mock->expectsAt(12)
     $mock->expectsAtLeastOnce()
     $mock->expectsNever()

## The changes were tested with PHPUnit 4.1 (latest stable)
So it would be nice to appear in the next minor? :-)