Generating output directories and output files for each script (xunit, logs, casper generated files, cookies) and minor changes

Generating output directories in target/casperjs for each script and executing each script in the created directory so that casperjs generated files (such as captures) are saved in the correct directory instead of in the  project basedir.
Xunit files are all named "results.xml" and are now saved in each script output directory.
Added the possibility to generate a log file for each script which contains the command line used and casperjs console output, saved in script output directories.
Added the possibility to save the cookies generated with the script execution and to make the scripts run with a preconfigured cookies file (option --cookies-file).
Changed --direct option (which is deprecated) to --verbose.
Added --ignore-ssl-errors and --proxy-auth options. 
Fixed comments about how to use <testsIncludes> parameter.

I am merging my commits in emergency (end of internship) and integration tests are missing, I will add them by the next week