README.md: fixed inconsistency with haml example
README.md: fixed inconsistency with haml example

ipmobiletech/backbone-rails,codebrew/backbone-rails,ArthurN/backbone-rails,ArthurN/backbone-rails,ipmobiletech/backbone-rails,ipmobiletech/backbone-rails,codebrew/backbone-rails,codebrew/backbone-rails,ArthurN/backbone-rails