Fix compatibility with newer Echoe, by using full-name for Platform.
Fix compatibility with newer Echoe, by using full-name for Platform.

Without this, rake will fail with Echoe 4.1 installed because of unknown
symbol Platform.

github/redcloth,purcell/redcloth,github/redcloth,dmitry/redcloth,dmitry/redcloth,amrocco/redcloth,amrocco/redcloth,mmorga/redcloth,purcell/redcloth,mmorga/redcloth