Merge pull request #1 from petomackay/deadly_skills

Deadly skills added to introduction.
Added new rule about coffee
Fix errors in rules.md
Merge pull request #2 from petomackay/new_rules

Too many people are spilling coffee
Revert "Deadly skills"
Merge pull request #3 from petomackay/revert-1-deadly_skills

Revert "Deadly skills"
Deadly skills.