Use `request.body.string` or `read` when appropriate.
Use `request.body.string` or `read` when appropriate.

It fixes an issue:
undefined method `string' for #<Unicorn::TeeInput>

robjacoby/trailblazer,undergroundwebdesigns/trailblazer,timoschilling/trailblazer,joshuawatson/trailblazer,baweaver/trailblazer,plribeiro3000/trailblazer,zwippie/trailblazer,apotonick/trailblazer,zwippie/trailblazer,undergroundwebdesigns/trailblazer,baweaver/trailblazer