Added fields (machine names) for the Gigs Offered content
Added fields (machine names) for the housing offered category
Added fields (machine names) for the housing wanted category
Added fields (Machine Names) to the For sale by owner category
replaced <li></li> with dashes so as to show up as list items on a .md file
Merge pull request #2 from amouer/mouerchanges

Merging updates to Day6.md from amouer