Removed the __clone method as cloning driver has been reverted
Fixed the execution of self-executing functions not wrapped in braces
Redirected the Selenium error output to the file

The normal output of selenium is too verbose and would be unusable and useless on Travis anyway
Merge pull request #114 from stof/execute_script

Fixed the execution of self-executing functions not wrapped in braces
Cleaned the testsuite thanks to changes in the driver testsuite
Cleaned the loading of testcases