Add configs in specs instead of changing
Add configs in specs instead of changing

The specs were failing on 1.9.3 because the `:input_encoding` config was
being overridden.

controlshift/premailer-rails,controlshift/premailer-rails,doorkeeper/premailer-rails,doorkeeper/premailer-rails,uswitch/premailer-rails,controlshift/premailer-rails,uswitch/premailer-rails,fphilipe/premailer-rails,fphilipe/premailer-rails,fphilipe/premailer-rails