Fix YAML Key Sort Trying to Update Nested Keys Based on Priority Sort

[pjkaufman]

Fixes #899

There was an issue where using a Priority Sort that had the same name as a nested key could cause it to be pulled out of the YAML if it preceded other keys with the same name that were not nested

Changes Made:

• Made sure to only try to sort a key if it is a key at the base of the YAML
• Made sure that we only pull back keys that are at the base of the YAML
• Added main.zip to git ignore since I accidentally committed it at one point
• Added wording clarification to make it clearer that nested keys are not to be sorted