#52 -raw option should make reports optional

[Vlad Roubtsov]

EMMA 2.1.5214

See
http://sourceforge.net/forum/forum.php?thread_id=1366962&forum_id=373865

When -raw option is used with emmarun/emmajava, it
should not be required to generate a report.
Specifically, if -r is not specified, it should not
default to "txt" report type.