extended ExpectedConditions with a list of new ones. New logic operat…

…ors + conditions for css and html attributes

reformat code (committed to set user.name and email)

method renamed to visibilityOfNestedElementsLocatedBy (pull request comments)

textContains replaced with a textMatches to extend scope of use cases

added more tests for new expected conditions, renamed left conditions with a wrong name (sub* instead of nested*)

added more tests for new expected conditions

js expected conditions names and processing fixed,  returning values for numberOfElements... conditions changed to List<WebElement>, tests fixed

methods names changed to follow code style convention

Signed-off-by: Daniel Davison <daniel.jj.davison@gmail.com>