Thows exception is samples_file doesn't exist
Test mode functionality added. New test added

Now you can specify -m test and application doe not submit a bsub job.
Instead it runs the script directly on the local machine
R session captured in stderr when running test

No output to screen. R session log is stored in r_session_log. For
debugging purposes we can print the content of this cvariable
Merge pull request #48 from js21/master

Test mode for deseq run implemented