Added logging facility to Screen Recorder
Changed properties, added cleanup after test
Altered README to reflect API changes
Corrected typo in README
another attempt to record videos only for failed tests

* Video is recorded to temporary file and moved to the video folder,
  if the test failed. The same is done with 'before' screenshots.

* Properties simplified and refactored. Now it possible to record
  whole test suite and take screenshots for failed tests.