semantic_flash_helper with string hash keys

[jaredmoody]

semantic_flash helper does not properly catch flash['alert'] as it's only checking for the symbol version, flash[:alert]

This is problematic for me because Devise uses string keys.

Easy fix is to use to_sym before the checks:

type = :success if type.to_sym == :notice
type = :error   if type.to_sym == :alert

I was working on a pull request but went to write specs and ran into #12. Will submit PR including new specs once that ticket is resolved.

[jaredmoody]

I think this should still be open unless there's been a change made so that semantic_flash catches string keys.