Consider "nil" as an valid value for highlight.

Fixes GH-106.
Merge branch 'master' of github.com:Adirelle/AdiButtonAuras
Hopefully fixed totem rules.

See GH-107.
Deathknight & hunter: fixed the "call pet" hints.
Paladin: show holy power on Divine Storm and Final Verdict.

Fixes GH-109.
Update README.md
Update README.md
Update RulesRef.md
Proof-read RulesRef.md
Typos in RulesRef.md