Make Watai compatible with Node v0.10

- Make config sanity checks compatible with Node ≥0.10 and also retrocompatible with Node 0.8
- Remove obsolete `path.basename`'s argument.
- Add `SucceedingSuite` in test's resources to ensure having a succeeding suite in tests which is not internet dependent.
- Refactor some tests condition with `SucceedingSuite` instead of `FailingSuite` for safety.