Consider passing classpath in file by default

[szpak]

It is already supported to useClasspathFile, but to make it easier to use for larger projects and to make the parameters passed to PIT more readable while reporting problems that option could be enabled by default.

For troubleshooting content of the file should be also printed with at the INFO level (the file should be automatically removed at the finished execution).

Btw, PIT already use that approach by default to communicate with its slaves minions.