Replace Blaze builder with bytestring-builder

Bytestring's builder is meant to subsume blaze-builder anyway. More
importantly, as of 0.10.4, Bytestring's builder module is marked
Trustworthy, making *all* of http-types Safe when that version is used.

I've only changed the version dependecy to the earlist one where `Data.ByteString.Lazy.Builder` is available to make the transition as easy as possible, even thought this module is going to be deprecated in favor of `Data.ByteString.Builder` and is not marked trustworthy until 0.10.4.