Improve tabular story report

Feedback from colleagues' first use of tabular story report introduced in 3.0.2 (JBEHAVE-339).

• The layout is too dispersive, too much white space and table runs away out of page
• Unnecessary (or misleading) repetitions of column headers, such as "Successful" and "Failed"
• More difficult to spot failures, only numbers are colour-coded

Suggestions include:

• Have a top-level multi-column row with two headers, "Scenarios" and "Steps".
• Use logos (with hovering text) for "Successful", "Failed", "Pending" etc ...
• Colour-code in red the story name in case of failure