Added functionality into the fold_math.py.
Merge branch 'master' of github.com:bravenewprince/deliverable_2 into math_funcs
Matt added tests but pushed to master.
Integrated the math module into the test class so that the names are

correct and it's callable. This means we can actually run the tests now!
Woo! However, almost all tests are pending for now. The next step is to
get them green, one by one.
Got the tests passing for both addition and subtraction

Also got the tests passing for average. Both are robust and reflect to
see if + and - are defined for the object.
Fixed bugs in multiply and split.

Divide and multiply are now passing tests. So is factorial. Added a few
more assertions to smoke out problems with split.
Merge pull request #1 from bravenewprince/math_funcs

Merging #1. 
Feelin' pretty good about it.