Touch-ups and standardization of Koans and Koan Core.

As a long-time student and current participant in the ExperienceIT program I found the Koans that were given to us sorely lacking. The purpose of many of the Koans was lost on the students. Furthermore, many of the koans were outright skipped due to the instructors being unable to discern any instruction or purpose behind some of them.

Personally, I found the exercise inefficient and not fit for a beginner's class. I thought it would be both beneficial to future students and myself to create a more standardized version of the exercise. This version would have more specific instructions and purposes behind each Koan. The idea is that students know what they are learning and they have enough knowledge to infer a solution to each Koan.

As a result of this goal, some Koans have been removed and some have been modified. Koans should have an objective that can be checked. This is critical feedback for a beginner who isn't entirely sure what they've done is correct.

If you have any questions or concerns feel free to contact me at hmfarran1@hawkmail.hfcc.edu or we can discuss any issues within this PR.