Remove debug messages
Remove a comment
Merge pull request #5 from Dinduks/remove_debug_msgs

Remove debug messages
Merge pull request #6 from Dinduks/remove_a_comment

Remove a comment
First letter of the error message should be capitalized
Improve the output

Or at least trying...

After running all the tests:
* Display the number of examples
* Display the number of failed examples
* Display the time in seconds it took to run the test suit
* Display the informations about the failed tests (instead of throwing
  an exception after each failure)
Specify imported classes
Remove the shutdownhook and the assertionErrors coll