PyTables 3.0.0 or higher is required for tests.
cyclus executable is expected to be included in PATH.

PyTables 3.0.0 or higher is required for tests.
cyclus executable is expected to be included in PATH.

The expected workflow for a user is 
    1) Run 'create_references.py' if there are no reference databases or 
        they need to be updated.
    2) Run 'nosetests test_cyclus.py'
    3) If more detailed report is needed about differences between particular
        hdf5 databases, the user has to write a script importing
        db_comparator function from cyclus_tools.py.

Add information about the expected workflow for a user.
Add information about the expected workflow for a user.
