module `CornerStones::Syntax` provides syntactic sugar.
`Table#values` returns an Array of values for a given column.
we can afford to load all options and use ruby to search through.

This prevents us from Capybara API changes where you need to specify,
:xpath to get it working.
Capybara does no longer bundle `wait_until`. We really need it.
we do not want `nil` and `""` as values. keep only `""` for consistency.
fix the build. :green_heart:
customizable error selectors to work with TB 3.0