I added a median function
Revert "I added a median function"

Reseting this to the state @gidden wanted for today's lesson.

This reverts commit b378e15007ba8ca5feaffb3f4a8b4374fac65084.
Fixing mean to behave correctly for floats.
I added the median function
Merge pull request #1 from crsl4/median

I added the median function
added tests of the median
Merge pull request #1 from welch16/median-tests

Median tests