create DbPostRepositoryTest for all(), find(), findBySlug() & activeByTag()
create test for DbPostRepository->search()
create test for DbPostRepository->create()
test returns for DbPostRepository
create test for DbPostRepository->findBySlug()
create tests for DbPostRepository update() & delete()
create tests for DbPostRepository allTags() and inject Tag
create last tests for DbPostRepository for validForCreation() & validForUpdate()
in DbPostRepository test Config & Cache
Merge branch 'feature/orchestra-testbench' into feature/DbPostRepositoryTest

* feature/orchestra-testbench:
  in Wardrobe\Cabinet\TestCase use \Orchestra\Testbench\TestCase
in DbPostRepositoryTest.php use Wardrobe\Cabinet\TestCase.php
Merge pull request #8 from MetalMatze/feature/DbPostRepositoryTest

Implemented the first few tests for the DbPostRepository