Add tools.py from scopatz/xdress
Add cyclus_tools.py with a function to call cyclus
Correct zip() error in run_cyclus function
Add script to create reference output databases
Add a check if the target output directories exist
Renamed the file with input and reference output file names
Correct import statement after renaming test_lists.py to testcases
Correct a bug in creating directories as needed for output.
Merge branch 'cyclus_tools' into regression_test
Stylistic errors are corrected
Merge pull request #170 from rakhimov/regression_test

Introduction of a capability to create reference databases
Adding a contributing authors file
Merge pull request #172 from opotowsky/develop

Adding a contributing authors file
fixing line break error in AUTHORS.rst
Merge pull request #173 from opotowsky/develop

fixing line break error in AUTHORS.rst
updating copyright date in License file
Merge pull request #174 from opotowsky/develop

updating copyright date in License file