Implemented timings show up on the same line (#19)

* Added the `TimerTestResult` and `TimerTestRunner` classes
  to take care of printing time result;
* Added the `colored_time` function that returns time string
  colored depending on passed options;
* Removed the `timer-verbose` option since it is not needed any
  more;
* Corrected unit tests.
Merge pull request #39 from skudriashev/report

Implemented timings show up on the same line (#19)