make request building referentially transparent
rename access to the RequestBuilder to 'underlying' as its more readable and sort of follows the same naming pattern as unfiltered (which models this in a similar way)
Merge branch 'master' into referential-transparency
Provide implicit conversions Req <-> RequestBuilder, with deprecation
warnings.
use implicit classes where possible
alias RequestBuilder methods to Req so they can be used directly
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
ls version info
version links
rm outdated warning
change defs to vals, restore link
update json4s dependencies (this removes the 2.10 withFilter compiler warnings)
update async http client deps
handle jsoup absolute refs
Merge pull request #64 from viktortnk/adjust-jsoup-absolute-refs-handling

handle jsoup absolute refs