Added pyramids to the implementation report and enabled tests

Also refined the implementation report for perimeter_of, area_of, and length_of
and incorporated new names for unary functions with _of

added 7 commits

• 8e3a05c1...1417ab3e - 6 commits from branch develop
• 27c0ce61 - Merge branch 'develop' into agrabowy

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added 6 commits

• c7e2b1ed - Renamed area to area_of
• 4c9c274d - Renamed centroid to centroid_of
• 11a4e830 - Renamed volume to volume_of
• a9d07b97 - Renamed perimeter to perimeter_of
• 253e8165 - Renamed normal to normal_of
• d6a8d95a - Refined the implementation report for perimeter_of, area_of, and volume_of

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changed the description

mentioned in commit 4643c259

merged