new update on .gitignore
fixes bug on CtStatementImpl.insertAfter

- ClassCastException was being thrown when trying to cast to
CtBlock. now the cast is made to CtStatementList.
- added test class spoon.test.ctCase.SwitchCaseTest and
resource test class spoon.test.ctCase.ClassWithSwitchExample
to test both insertAfter and insertBefore.