Html Elements:
1. element methods return element instance for fluid interface
2. renaming checkbox methods (e.g. from "select" to "check") to make more sense to the end user
3. improving checkbox label detection (via 3 step approach)
4. seeting TypifiedElementProxy wrapper class to non-abstract class
5. fixing live element test include path
Html Elements:
1. adding live/non-live tests for Button and CheckBox