Create SPF.md

SPF Glossary definition
Create Spam_Traps.md

User Guide Glossary term entry: Spam Traps
Merge branch 'develop' of https://github.com/stephenswhite/docs into stephenswhite-develop
Added a link to blacklists and moved the blacklist file to blacklist.md
renamed this file
Merge branch 'stephenswhite-develop' into develop