tmpCommit: Addding tests in testsncat.py to testSNIaFunctionality.py.
Have defined the tests we want, but have not put in functions yet.
Change: Changed range of dates in mjd to 2 rather than 20 for fast
checking.
testSNIaFunctionality.py: constructed a setUpClass Method which now has
    the testCreateCat functionality and constructed the test for checking
    the output light curve against the standard one
Fixed bug