Refactor Travis CI.
Replace `LITHIUM_*` constant to `Libraries::get()` when possible.
Fixes failed integration tests caused by the new test API.
Set `'test'` as the unique connection for integration tests.
Default application library name is no more limited to `'app'`.
Refactoring the test suite. Test filename must now end with `'Test'`.
Fixes integration tests.
Merge pull request #862 from jails/feature/tests-ci

First refactoring for including integration tests in the CI process.