Revert "use implicit classes where possible"

(we still want to support 2.9.3)

This reverts commit bec0119eee0dc2eb5d3b4d5caa18452a16abe469.

Conflicts:
	core/src/main/scala/package.scala
mix request verb traits into Req, for less implicit instatiation
sbt 0.12.4
remove deprecated methods designated in prior versions
0.11.0
copy tweaks