Process unpaired (SRA) data
Merge pull request #13 from ckennedy-nmdp/new-feature-branch

Process unpaired (SRA) data
improving error message on TOOLDIR setting.  Fixes issue #11
Merge pull request #15 from janders3-nmdp/fix_splitter_abort

improving error message on TOOLDIR setting.  Fixes issue #11
creation of prep_data_dir, dependant on presence of /opt/data/tutorial/fastq.  fixes Issue #12
Merge pull request #16 from janders3-nmdp/tutorial_data_dir

creation of prep_data_dir, dependant on presence of /opt/data/tutorial/f...