Using a single 'name' instead of 'first/last' -- with tests

* Moved names over to just 'name' and removed 'first_name/last_name' from schema
* closes #45
* Added Person unit tests
* Configured Travis Continuous Integration
* TODO: Add more tests
Correct Travis phpunit path
Merge pull request #55 from ushahidi/person-2-dev

Using a single 'name' instead of 'first/last' -- with tests