Create relations_obvious.txt

First pass contains 445 relations. The format is tab delimited because I copied them out of my list in excel. Let me know if another format is easier.
Create relations_obvious.md

Added markdown table draft.
Update relations_obvious.md
Update relations_obvious.md
Update relations_obvious.md
Update relations_obvious.md
Updated readme for relations
Merge pull request #18 from thoppe/relations_filter

Relations filter