Renaming parallel to parallel.py
Changing all_tests.py to call parallel.py instead of parallel
Added verbosity to the execution order validator error messages
Using skbio sequence iterators for splitting the files
Simplifying add_node calls on align seqs
Initialize the job graph on the base class
Generalizing command_wrapper call
Improving command_wrapper doc
Reducing code duplication on blast.py
Moving results handler functions to util
Modify blast.py so it uses the new command_wrapper
Modify map_reads_to_reference.py so it uses the new command_wrapper
Modify pick_otus.py so it uses the new command_wrapper
Modify assign_taxonomy.py so it uses the new command_wrapper
Refactor of parallel identify_chimeric_seqs.py
Modifying parallel_identify_chimeric_seqs.py to work with the refactor