Skipped tests should not be considered to have passed, they haven't even been
run.

The JUnit XML parser should be extended to detect the "<skipped />" element
that is output by TestNG and the test results page should display "Skipped" as
an alternative status to "Passed" and "Failed".

If possible, the blue/red passed/failed bar at the top of the report should
include a yellow part for any skipped tests.