Añadidos los tests:
 * itShouldReturns400WhenPostPetitionIsMalformed
* itShouldReturns405WhenMethodNotAllowed
* itShouldReturns400WhenPutPetitionIsMalformed(
* itShouldReturns404WhenTryToDeleteInexistentResource
Añadido el test: * itShouldReturns404WhenTryToEditInexistentResource