v1.0.40

Commits:

• 0fa63e2 Added containsElements() and shouldContainElements() methods to WebElementFacade (@wakaleo)
• 9d9c5a4 Added a convenience method to allow more fluent waitFor() constructs (@wakaleo)
• e7235f7 Refactored wait logic to use distinct values for implicit waits and wait-for waits. (@wakaleo)