Dumper::dumpException() doesn't modify exception
tester: option `-log` changed to `-l` or `--log` to be consistent with others options
ConsolePrinter: prints last 15 lines of output instead of first 15 lines
Merge branch 'pull-tweaks' of https://github.com/dg/tester into dg-pull-tweaks

Conflicts:
	Tester/Runner/Output/ConsolePrinter.php