* Adding a timing mode that records test execution times per host.
This is for catching regressions (or improvements :) that lets
execution times divert significantly. Linux only for now. See the
README for more information. (Robin Sommer)
* Adding color to test status when writing to console. (Robin Sommer)
* A bit of refactoring to define the status messages ("ok", "failed")
only at a single location.
Also added a note when a test declared as expecting failure in fact
succeeds. (Robin Sommer)