Remove duplicated code

They both do the same thing!
Define Lotus::Presenter#respond_to_missing?
Make minor text correction on README
Merge pull request #24 from joneslee85/patch-2

Remove duplicated code in tests
Merge pull request #25 from splattael/presenter-respond_to_missing

Define Lotus::Presenter#respond_to_missing?
Merge pull request #26 from Erol/small-documentation-fix

Make minor text correction on README