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Pass error object to next() when it isn't a BadRequest.
Add combohandler#respond convenience method.
Explicitly test different kinds of errors before and after default middleware.
Use contentType method and charset property instead of res.header.
Move BadRequest into separate file, with inheritance test.
Give names to middleware function expressions to aid debugging and avoid arguments.callee.
Use path utilities to rewrite CSS url()s instead of custom algorithm.
Merge pull request #15 from zillow/prepare-for-middleware

Prepare for middleware with various tweaks to better match express conventions.