updated README
the floor function takes keyword arguments with arbitrary values for the time intervals, making the function more flexible
updated ceil function so it operates like C's ceil function. This means that datetimes that are already on a boundary are returned
added one final ceil test
addressed jeffs comment and updated README
updated the README and setup
updated docs
updated docs
updated docs
Merge pull request #6 from wesleykendall/develop

Updated floor function and added ceil function