Add pythonic aliases for comparison predicates.

[EricApostal]

[ ] Added changes to CHANGELOG.md
[ ] Bumped version number (delete if unneeded)

Changes proposed:
Add pythonic aliases for comparison predicates.
Ex: added are.greater_than as an alias of are.above

[davidwagner]

Can you help me understand the rationale for why this addition is needed/beneficial?

[EricApostal]

Can you help me understand the rationale for why this addition is needed/beneficial?

While keywords like above and below do make some sense, it's unconventional as comparison operators read like greater_than and less_than. It reads a lot more natural for those learning to code, as it keeps everything more in-line with coding convention.

[EricApostal]

I would also like to add that this is the notation already used in the some of the function's descriptions.
Snippet from predicates.py:

@staticmethod
def above(y):
    """Greater than y."""

[adnanhemani]

I can agree to seeing that this might be beneficial and it's great that it's just adding a simple alias, so there's no code maintainability issues. I just want to ensure that code testing coverage isn't hit as a result of this new code, so can we please add some testing code around the new methods?

Once we have the testing code, I can merge this in, it's in great condition. Thanks!

[EricApostal]

I added methods replicating the existing ones. I've never worked with pytest, however, so please do let me know if anything needs to be amended.

[coveralls]

Coverage: 92.689% (-0.05%) from 92.739% when pulling 4608d2f on SirTZN:master into 28b0841 on data-8:master.

[adnanhemani]

Hey, this is very close to being mergable - thank you! You should be able to see updated coverage when you push new commits now.

[adnanhemani]

We don't need this line. Just the first one is fine :)

[adnanhemani]

Based on: https://coveralls.io/builds/55559799/source?filename=datascience%2Fpredicates.py

We're missing test coverage on this method and a few others. The tests you've created are fantastic so far, if you could please add a few more for the missing test methods - this should be mergeable!