WIP: Test suite setup improvement

Refactored test suite setup
* Adjusted namespace definition in composer.json
* Corrected namespaces in Neo4jClientMock, as \ before fqdcn are not required when using namespaces correctly
* Added a .travis.yml file for using Travis and having a real db to test on
* Added a Import file to import data when the Slim bootstrap is done

I just need to look a bit deeper of how to bootstrap the app correctly for integration tests.

Running `phpunit` is ok.

Would be cool if merged to add `Travis` service webhook
I mean having an /app dir where you would move the big processing done in the index.php file, and from the index you just require the files from the app_dir.

for example you can have in app/ 

```
- app/
-- config_dev.php
-- config_test.php
-- config_prod.php
-- controllers/
--- routing_dev.php
--- routing_prod.php
```

And from the index you load the files based on the SLIM_MODE