Toward a tidier, more Scalaz-like management of implicits.
Clean up Http4sString.
Get examples out of nested package, so we can see real world imports.
Merge branch 'topic/implicits-out-of-package-object' into develop

Conflicts:
	core/src/main/scala/org/http4s/AuthScheme.scala
	core/src/main/scala/org/http4s/Chunk.scala
	core/src/main/scala/org/http4s/ContentCoding.scala
	core/src/main/scala/org/http4s/ServerProtocol.scala
	core/src/main/scala/org/http4s/TransferCoding.scala
	examples/src/main/scala/org/http4s/examples/ExampleRoute.scala