Removed unused variable.
Changed Symbol.respond_to?(:dowcase) to :symbol.respond_to?(:downcase)

The Symbol class does not respond to :downcase, only instances do.
There may be 'better' ways to do this, but I am unwilling to spend
time on it when I know this will work in both 1.8 & 1.9.
Merge pull request #96 from ToadJamb/reduced-warnings

Reduced warnings